Chosen Solution
My Monitor randomly lose signal when playing video games and I can hear the sound of a disconnected USB when this occur, also I can still hear the sound of the game running on the backgroud for a minute or so and I had to hard reset my Computer by pressing the power button to turn it off and then restart . I checked my CPU and GPU temperatures and they are just fine never got above 60C, I changed the thermal paste for both of them. first it happened when I was playing Borderlands 2, and I was playing this game for over 2 years now on the same rig and had no problem at all, and now it happens again with other titles and even with non demanding games. My PC SPECS are I7 4790 Nvidia GTX 970 x1 8Go RAM 1 To HDD
something you can try is to “bake” the GPU . this is not necessarily a permanent fix but I have found it to work permanently on several machines I have. I did this on my Imac and it has continued to work for at least 4 months without issue. hear is a link to the video. https://youtu.be/5aQPPaeczyM
I think that you have problems with cooler and your graphics card gets overheated. I had a very same problem something like a year ago. I was playing Overwatch and my PC started to shut down the monitor from time to time. The problem was - I’ve found the cheapest Overwatch boost service and spent some money on my hero’s boosting. And I was feeling sorry because I was loosing this money due to the inability to play. But I solved problem by buying and installing a new cooler.
