Originally Posted by
Lathais
What did you attempt to use to test the memory? If you use memtest, the computer does not need to boot from anything but a USB stick and can test the memory from there. If it's failing while doing that, it is likely your memory.
As a quick test, you can remove one stick of RAM(if you have multiples) and see how you run for a while with just the one. If everything goes ok for a while, swap them out and try the other one.
Sometimes this can be as simple as one of the sticks came a little loose, so just playing with it like this can solve the issue entirely.