Originally Posted by Nunbrew
All good answers. Thank you.
I guess I'll wait till it happens again and then see what can be done.
I don't recommend waiting.
Get memtest86 and a dos bootable USB drive, then set it to loop one time before going to sleep. Check it after you wake up. If the memory is bad, a 4+ hour loop will have a 99.998% chance of finding it.
Or run the system check on endless loop. If you are using PC Check, look at the results after waking. If you are using the Dell ones, don't worry, they will wake you on finding a problem.
It's better to know before you have the problem reoccur so you can prepare to handle it.