Its an old Asus P8P67 MB. BIOS hasn’t been updated on it since 2012. I’m one version out of date on it, so can’t see it making too much difference. I think its either the SSD failing or, could be my PSU dropping power. It is 6 years old now.
Sounds like a PSU issue to me. Maybe your caps are going and are failing to draw the required current hence why you are losing functions in a haphazard fashion. Have you tried a 12v and 5v power level monitor app that provides a log?
I’ve ran one app that records everything but only really checked the logs for temp. Will have a look at power later.
Asus board so it should have an option to reboot in case of over/undervolt situation happens on the PSU. Just depends if the PSU is returning the correct info.