WS-12-250-AC started crashing and rebooting

[wisp-wand]

I have a fairly elderly WS-12-250-AC which has worked fine for over 2 years. The site has fibre primary and was AF5X-HD now AF60LR backup from another tower.
Since I swapped the AF5xHD with the AF60LR the switch reboots randomly after around a week. Power for the AF5X and the AF60LR is 48v (not VH)
The software is 1.4.9.
Obviously I can upgrade the software, but to which version - it ran fine for 2 years on 1.4.9 without issue. It has no internet access.

It looks like a usual boot in the logs no pointers there:-


Jan 1 00:00:06 netonix: 1.4.9 on WS-12-250-AC
Jan 1 00:00:10 system: Setting MAC address from flash configuration: xxx
Jan 1 00:00:12 system: starting ntpclient
Jan 1 00:00:13 admin: adding lan (eth0.xxx) to firewall zone lan
Jan 1 00:00:24 dropbear[768]: Running in background
Jan 1 00:00:26 switch[796]: Detected cold boot
Jan 1 00:00:28 switch[796]: PoE enabled on port 1, PoE Smart is starting cable check
Jan 1 00:00:28 switch[796]: PoE enabled on port 2, PoE Smart is starting cable check
Jan 1 00:00:28 switch[796]: PoE enabled on port 3, PoE Smart is starting cable check
Jan 1 00:00:28 switch[796]: PoE enabled on port 4, PoE Smart is starting cable check
Jan 1 00:00:28 switch[796]: PoE enabled on port 12, PoE Smart is starting cable check
Jan 1 00:00:28 system: starting ntpclient
May 12 09:49:14 switch[796]: Port 1 cable check results: Open, Ok, Ok, Ok
May 12 09:49:14 switch[796]: Port 1 passed PoE Smart cable check, turning on power
May 12 09:49:14 switch[796]: Port 2 cable check results: Open, Ok, Ok, Ok
May 12 09:49:14 switch[796]: Port 2 passed PoE Smart cable check, turning on power
May 12 09:49:14 switch[796]: Port 3 cable check results: Open, Open, Open, Open
May 12 09:49:14 switch[796]: Port 3 passed PoE Smart cable check, turning on power
May 12 09:49:14 switch[796]: Port 4 cable check results: Open, Open, Open, Open
May 12 09:49:14 switch[796]: Port 4 passed PoE Smart cable check, turning on power
May 12 09:49:14 switch[796]: Port 12 cable check results: Open, Open, Open, Open
May 12 09:49:14 switch[796]: Port 12 passed PoE Smart cable check, turning on power

Any other suggestions?

Thanks

Wayne