old pc is hard locking every few minutes

Hi

My old computer - 4770k. gtx1070 is hard locking every few minutes - i have to press reset button on pc case.

I reinstalled windows 10 and run memtestx86 and check ssd drive with crucial executive tool - and everything was fine for like a week.

Now it started hardlocking again. It can not run for more than 5 minutes. Nothing is actually installed after i re installed windows - only Chrome and nvidia drivers..

It is only used for light web surfing.

Any idea?