I have struggled a long time with this problem, and it genuinely gets me so frustrated.
I have built an AMD rig in december 2019 (2 months ago), specifications are below:
GPU: ASROCK radeon 5700xt
CPU: amd ryzen 5 3600
PCU: Corsair CX550W
RAM: Corsair Vengeance LPX CMK16GX4M2B3200C16 (2x8gb)
Motherboard: MSI B450 Tomahawk MAX
SSD: Kingston A2000 500gb M2.SSD
Monitor: AOC 24G2U
The PC has good performance in AAA games such as Modern Warfare/forza horizon 4, however it randomly loses signal and/or gives a black screen. I then have to turn off the power from the PSU in order to be able to reboot the system.
The black screen also occurs in lighter games such as Rocket League, it's really frustrating and ruins my gaming experience. I have read that there are a lot of people that experience this problem, since it has to do with AMD's drivers. I have tried running old GPU drivers, and currently run version 20.2.1, no succes.
Lastly, I would like to note that I haven't messed with any of the settings. I haven't overclocked the GPU or undervolted it, Furthermore in long gaming sessions the GPU reaches a temperature of max 80-85 degrees.
I hope anyone knows whether to fix this problem, and/or whether this is in the warranty.