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I have a new WS-12-250-DC That I am experiencing frequent unexpected port bounces. This is the second switch that I put in the same location that is experiencing this issue, so I do not believe the switch is the culprit, but I need guidance in finding the cause. Thank you.

See log below...


May 14 07:45:23 Port: link state changed to 'down' on port 8
May 14 07:45:23 Port: link state changed to 'down' on port 6
May 14 07:45:25 Port: link state changed to 'up' (1G) on port 8
May 14 07:45:26 Port: link state changed to 'up' (1G) on port 6
May 14 07:45:45 Port: link state changed to 'down' on port 8
May 14 07:45:45 Port: link state changed to 'down' on port 6
May 14 07:45:47 Port: link state changed to 'up' (1G) on port 8
May 14 07:45:48 Port: link state changed to 'up' (1G) on port 6
May 14 08:17:56 Port: link state changed to 'down' on port 6
May 14 08:17:58 Port: link state changed to 'up' (1G) on port 6
May 14 08:18:13 Port: link state changed to 'down' on port 6
May 14 08:18:16 Port: link state changed to 'up' (1G) on port 6
May 14 08:18:30 Port: link state changed to 'down' on port 6
May 14 08:18:36 Port: link state changed to 'up' (1G) on port 6
May 14 08:18:37 Port: link state changed to 'down' on port 6
May 14 08:18:39 Port: link state changed to 'up' (1G) on port 6
May 15 09:09:21 Port: link state changed to 'down' on port 6
May 15 09:09:21 Port: link state changed to 'down' on port 8
May 15 09:09:23 Port: link state changed to 'up' (1G) on port 8
May 15 09:09:24 Port: link state changed to 'up' (1G) on port 6
May 15 09:09:31 Port: link state changed to 'down' on port 8
May 15 09:09:31 Port: link state changed to 'down' on port 6
May 15 09:09:32 Port: link state changed to 'up' (1G) on port 8
May 15 09:09:33 Port: link state changed to 'up' (1G) on port 6
May 15 16:13:11 Port: link state changed to 'down' on port 6
May 15 16:13:11 Port: link state changed to 'down' on port 8
May 15 16:13:24 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:13:24 switch[3370]: unexpected link change on port 6 (1-150-5) from 1G to 100M-F
May 15 16:13:25 Port: link state changed to 'down' on port 6
May 15 16:13:27 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:13:28 Port: link state changed to 'up' (100M-F) on port 8
May 15 16:13:28 switch[3372]: unexpected link change on port 8 (AF5x) from 1G to 100M-F
May 15 16:13:28 Port: link state changed to 'down' on port 6
May 15 16:13:30 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:13:31 Port: link state changed to 'down' on port 6
May 15 16:13:44 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:13:44 Port: link state changed to 'down' on port 6
May 15 16:13:47 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:13:47 Port: link state changed to 'down' on port 6
May 15 16:13:50 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:13:51 Port: link state changed to 'down' on port 6
May 15 16:14:04 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:14:04 Port: link state changed to 'down' on port 6
May 15 16:14:07 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:14:07 Port: link state changed to 'down' on port 6
May 15 16:14:10 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:14:11 Port: link state changed to 'down' on port 6
May 15 16:14:25 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:14:26 Port: link state changed to 'down' on port 6
May 15 16:14:28 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:14:29 Port: link state changed to 'down' on port 6
May 15 16:14:32 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:14:32 Port: link state changed to 'down' on port 6
May 15 16:14:45 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:14:46 Port: link state changed to 'down' on port 6
May 15 16:14:48 Port: link state changed to 'up' (1G) on port 6
May 15 16:14:57 Port: link state changed to 'down' on port 6
May 15 16:15:11 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:15:13 Port: link state changed to 'down' on port 6
May 15 16:15:19 Port: link state changed to 'up' (1G) on port 6
May 15 16:16:29 Port: link state changed to 'down' on port 6
May 15 16:16:42 Port: link state changed to 'up' (100M-F) on port 6
May 15 16:17:07 Port: link state changed to 'down' on port 6
May 15 16:17:09 Port: link state changed to 'up' (1G) on port 6
May 16 08:42:43 Port: link state changed to 'down' on port 6
May 16 08:42:46 Port: link state changed to 'up' (1G) on port 6
May 16 08:43:04 Port: link state changed to 'down' on port 6
May 16 08:43:10 Port: link state changed to 'up' (1G) on port 6
May 16 08:43:23 Port: link state changed to 'down' on port 6
May 16 08:43:26 Port: link state changed to 'up' (1G) on port 6
May 16 08:43:31 Port: link state changed to 'down' on port 6
May 16 08:43:34 Port: link state changed to 'up' (1G) on port 6
May 16 08:44:23 Port: link state changed to 'down' on port 6
May 16 08:44:26 Port: link state changed to 'up' (1G) on port 6
May 16 08:44:39 Port: link state changed to 'down' on port 6
May 16 08:44:49 Port: link state changed to 'up' (1G) on port 6
May 16 08:44:55 Port: link state changed to 'down' on port 6
May 16 08:44:58 Port: link state changed to 'up' (1G) on port 6
May 16 08:59:53 Port: link state changed to 'down' on port 6
May 16 08:59:56 Port: link state changed to 'up' (1G) on port 6
May 16 08:59:59 Port: link state changed to 'down' on port 6
May 16 09:00:06 Port: link state changed to 'up' (1G) on port 6
May 16 09:00:25 Port: link state changed to 'down' on port 6
May 16 09:00:28 Port: link state changed to 'up' (1G) on port 6
May 16 09:00:30 Port: link state changed to 'down' on port 6
May 16 09:00:32 Port: link state changed to 'up' (1G) on port 6
May 16 11:26:35 Port: link state changed to 'down' on port 6
May 16 11:26:37 Port: link state changed to 'up' (1G) on port 6
May 16 11:26:44 Port: link state changed to 'down' on port 6
May 16 11:26:50 Port: link state changed to 'up' (1G) on port 6
May 16 17:52:01 Port: link state changed to 'down' on port 6
May 16 17:52:04 Port: link state changed to 'up' (1G) on port 6
May 16 17:52:09 Port: link state changed to 'down' on port 6
May 16 17:52:19 Port: link state changed to 'up' (1G) on port 6
May 16 17:52:30 Port: link state changed to 'down' on port 6
May 16 17:52:39 Port: link state changed to 'up' (1G) on port 6
May 16 17:52:58 Port: link state changed to 'down' on port 6
May 16 17:53:05 Port: link state changed to 'up' (1G) on port 6
May 16 17:53:06 Port: link state changed to 'down' on port 6
May 16 17:53:13 Port: link state changed to 'up' (1G) on port 6
May 16 17:53:19 Port: link state changed to 'down' on port 6
May 16 17:53:22 Port: link state changed to 'up' (1G) on port 6
May 16 17:59:16 Port: link state changed to 'down' on port 6
May 16 17:59:19 Port: link state changed to 'up' (1G) on port 6
May 16 17:59:31 Port: link state changed to 'down' on port 6
May 16 17:59:34 Port: link state changed to 'up' (1G) on port 6
May 16 17:59:51 Port: link state changed to 'down' on port 6
May 16 17:59:54 Port: link state changed to 'up' (1G) on port 6
May 16 18:00:11 Port: link state changed to 'down' on port 6
May 16 18:00:17 Port: link state changed to 'up' (1G) on port 6
May 16 18:01:37 Port: link state changed to 'down' on port 6
May 16 18:01:44 Port: link state changed to 'up' (1G) on port 6
May 16 18:56:01 Port: link state changed to 'down' on port 6
May 16 18:56:04 Port: link state changed to 'up' (1G) on port 6
May 16 18:56:33 Port: link state changed to 'down' on port 6
May 16 18:56:35 Port: link state changed to 'up' (1G) on port 6
May 16 18:56:42 Port: link state changed to 'down' on port 6
May 16 18:56:56 Port: link state changed to 'up' (1G) on port 6
May 16 18:57:17 Port: link state changed to 'down' on port 6
May 16 18:57:20 Port: link state changed to 'up' (1G) on port 6
May 16 18:57:31 Port: link state changed to 'down' on port 6
May 16 18:57:35 Port: link state changed to 'up' (1G) on port 6
May 16 18:57:59 Port: link state changed to 'down' on port 6
May 16 18:58:06 Port: link state changed to 'up' (1G) on port 6
May 16 18:58:11 Port: link state changed to 'down' on port 6
May 16 18:58:14 Port: link state changed to 'up' (1G) on port 6
May 16 18:58:38 Port: link state changed to 'down' on port 6
May 16 18:58:46 Port: link state changed to 'up' (1G) on port 6
May 16 18:58:56 Port: link state changed to 'down' on port 6
May 16 18:59:09 Port: link state changed to 'up' (100M-F) on port 6
May 16 19:37:01 Port: link state changed to 'down' on port 6
May 16 19:37:14 Port: link state changed to 'up' (100M-F) on port 6
May 16 19:37:15 Port: link state changed to 'down' on port 6
May 16 19:37:17 Port: link state changed to 'up' (100M-F) on port 6
May 18 11:42:07 Port: link state changed to 'down' on port 6
May 18 11:42:10 Port: link state changed to 'up' (1G) on port 6
May 18 11:42:10 switch[2415]: unexpected link change on port 6 (1-150-5) from 100M-F to 1G
May 18 11:42:33 Port: link state changed to 'down' on port 6
May 18 11:42:35 Port: link state changed to 'up' (1G) on port 6
May 18 11:42:38 Port: link state changed to 'down' on port 6
May 18 11:42:41 Port: link state changed to 'up' (1G) on port 6
May 18 11:42:51 Port: link state changed to 'down' on port 6
May 18 11:42:57 Port: link state changed to 'up' (1G) on port 6
May 18 11:43:27 Port: link state changed to 'down' on port 6
May 18 11:43:30 Port: link state changed to 'up' (1G) on port 6
May 18 11:44:15 Port: link state changed to 'down' on port 6
May 18 11:44:21 Port: link state changed to 'up' (1G) on port 6
May 18 11:46:03 Port: link state changed to 'down' on port 6
May 18 11:46:06 Port: link state changed to 'up' (1G) on port 6
May 18 11:46:52 Port: link state changed to 'down' on port 6
May 18 11:46:56 Port: link state changed to 'up' (1G) on port 6
May 18 11:47:05 Port: link state changed to 'down' on port 6
May 18 11:47:11 Port: link state changed to 'up' (1G) on port 6
May 18 11:47:18 Port: link state changed to 'down' on port 6
May 18 11:47:26 Port: link state changed to 'up' (1G) on port 6
May 18 11:51:05 Port: link state changed to 'down' on port 6
May 18 11:51:07 Port: link state changed to 'up' (1G) on port 6
May 18 11:51:09 Port: link state changed to 'down' on port 6
May 18 11:51:12 Port: link state changed to 'up' (1G) on port 6
May 18 11:53:28 Port: link state changed to 'down' on port 6
May 18 11:53:34 Port: link state changed to 'up' (1G) on port 6
May 18 11:53:42 Port: link state changed to 'down' on port 6
May 18 11:53:50 Port: link state changed to 'up' (1G) on port 6
May 18 11:53:50 Port: link state changed to 'down' on port 6
May 18 11:53:53 Port: link state changed to 'up' (1G) on port 6
May 18 11:53:55 Port: link state changed to 'down' on port 6
May 18 11:53:59 Port: link state changed to 'up' (1G) on port 6
May 18 11:54:13 Port: link state changed to 'down' on port 6
May 18 11:54:19 Port: link state changed to 'up' (1G) on port 6
May 18 11:54:22 Port: link state changed to 'down' on port 6
May 18 11:54:24 Port: link state changed to 'up' (1G) on port 6
May 18 11:55:13 Port: link state changed to 'down' on port 6
May 18 11:55:20 Port: link state changed to 'up' (1G) on port 6
May 18 11:55:32 Port: link state changed to 'down' on port 6
May 18 11:55:38 Port: link state changed to 'up' (1G) on port 6
May 18 11:55:47 Port: link state changed to 'down' on port 6
May 18 11:55:53 Port: link state changed to 'up' (1G) on port 6
May 18 11:56:09 Port: link state changed to 'down' on port 6
May 18 11:56:15 Port: link state changed to 'up' (1G) on port 6
May 18 11:58:22 Port: link state changed to 'down' on port 6
May 18 11:58:24 Port: link state changed to 'up' (1G) on port 6
May 18 11:58:28 Port: link state changed to 'down' on port 6
May 18 11:58:30 Port: link state changed to 'up' (1G) on port 6
May 18 11:58:49 Port: link state changed to 'down' on port 6
May 18 11:58:55 Port: link state changed to 'up' (1G) on port 6
May 18 11:59:05 Port: link state changed to 'down' on port 6
May 18 11:59:08 Port: link state changed to 'up' (1G) on port 6
May 18 11:59:25 Port: link state changed to 'down' on port 6
May 18 11:59:27 Port: link state changed to 'up' (1G) on port 6
May 18 11:59:30 Port: link state changed to 'down' on port 6
May 18 11:59:32 Port: link state changed to 'up' (1G) on port 6
May 18 12:05:43 Port: link state changed to 'down' on port 6
May 18 12:05:49 Port: link state changed to 'up' (1G) on port 6
May 18 12:05:57 Port: link state changed to 'down' on port 6
May 18 12:06:03 Port: link state changed to 'up' (1G) on port 6
May 18 12:06:09 Port: link state changed to 'down' on port 6
May 18 12:06:21 Port: link state changed to 'up' (100M-F) on port 6
May 18 12:08:40 Port: link state changed to 'down' on port 6
May 18 12:08:43 Port: link state changed to 'up' (1G) on port 6
May 18 12:12:50 Port: link state changed to 'down' on port 6
May 18 12:12:52 Port: link state changed to 'up' (1G) on port 6
May 19 03:06:07 Port: link state changed to 'down' on port 6
May 19 03:06:19 Port: link state changed to 'up' (100M-F) on port 6
May 19 03:06:20 switch[2473]: unexpected link change on port 6 (1-150-5) from 1G to 100M-F

Possible causes:
Bad cable
Bad end (crimp)
Bad radio ethernet port
Noise on the wire
You have the port speed/duplex in the switch or radio set to a specific speed/duplex and not set to AUTO which you should always do.

I feel like I have sufficiently ruled out cable ends and crimps, and the ports are set to auto negotiate.

I was already leaning towards "noise", but is there an easy way to test for that?