I have strange error with DayZ (other games are working good). My entire computer freezes on random times. Once it's 5 min, another time it's 90 min of playtime.
It doesn't look like overheating because there are times when after freeze and restarting PC I can play another hour without the problem.
What is strange: when I'm in discord I can hear my teammates and talk with them (push to talk), so only graphics is frozen. Alt + ctrl + del doesn't working (or not showing on screen if push to talk on discord works).
Overall gameplay is very smooth (90 fps minimum). I had try lowering graphic from high to medium and it doesn't help.
I have updated graphic card driver. Tried to run game as administrator: the same.

I'm recently playing on modded servers like with DayZSALanucher but I remember problem occurred on on official servers too.

Do you have any ideas what can I try to fix it? Do you need any more info?

Ps. I prefer not to send data from DxDiag (due to privacy concerns)