Some ideas...

It's spring. Do you have change hardware configuration since last year
so the PC is more hot, or does it use more electric power ? I had this
kind of problem last summer when I add a hard disk and a new graphic
card.

You could also check memory with Grub at boot.

But in these cases the system is fully frozen, and you need power off.

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Cannot type anymore - need to reboot
https://bugs.launchpad.net/bugs/379764
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