Since a few weeks, I have a very weird PC problem. When loading up some games (so not while actually playing, but loading into the main menu (COD BO Cold War especially nowadays) or loading in the map), my monitor is losing its signal and the fans of my GPU are spinning at a 100%. Music/gamesounds are still played in the right way, just the video output is lost. The only solution is to turn off the PC by holding the bower button and restarting it. After restarting, no weird errors or anything occur, only when I start a game again. Another example is with alt-tabing from assetto corsa, the same issue happened. This however was resolved by removing the GPU drivers and re-installing them and now I can happily alt-tab from that game. If I do make it into the COD BO Cold War menu, after using the safe launch option (downgrading the graphics), I can put everything back to high settings and play with 75 fps and no issue whatsoever. Most games have no issues at all (For example, COD Warzone, Crusader Kings III, Age of Empires II HD), while others sometimes do (MS flight sim, Universim).
So I tested many different things already, from removing the GPU drivers (with DDU) till stress-testing both CPU and GPU at the same time to make sure it is not an overheating problem. Temps are perfect, and no crashes while stress-testing both CPU and GPU at the same time (so I guess no PSU problem?). I checked my RAM as well with the windows memory checker, no problems there. I'm hopeless what to do at this moment.
PC Specs: (Updated, bought a new psu. problem still not resolved)
Windows 10 Pro 64 bit
MoBo: Asrock b450 steel legend (latest bios installed)
CPU: AMD Ryzen 3600x with Gelid Tranquillo rev 4 cooler
GPU: KFA2 (aka Galax) GeForce RTX 2060 Super
PSU: Fractal ion+ 860P
RAM: G.SKILL 16GB 3200mhz
Storage: One m.2 SSD with windows and programs on it / two HDDs with total of 4GB storage, games are installed on one of these HDDs
Monitor: LG ultra-wide 21:9 Full HD 75hz monitor
Please help me resolve this issue, you would forever have my gratitude.