So.... It started like week ago and my pc started to be retarded. At random time (specially in the evening) my monitor just goes black. But it still works, i can change setting manually on monitor. It looks like GPU has disconnected from monitor. So i tought its heat problem. I made several stress test from several softwares and it did not happend for like 10 minutes. Then it happened again. SO i cleaned computer from dust. I disconnected every component and even disassambled GPU and cleaned it separatly. It did not helped. So i Updated GPU and monitor drivers and also updated windows system. And its still happening. Its also not problem in power source because when i am on call with someone and monitor goes black we can still hear and speak to each other. Any advices whats problem?