I'm having an odd issue I can not seem to figure out whats going on. When I go to start a game like Star Wars: Jedi Fallen Order my FPS will go from 120 and in the course of a couple minutes drop to 5-15 FPS then the monitor will no longer display my PC and I would have to restart to get it back up. Just yesterday I got a new monitor thinking it was the fact I was using an old LG TV as the display but it continued to happen. I have made sure the Graphics Drivers have all been up to date as well. I recently finished setting this up about a couple months ago and not sure what could be going on.
The specs of my PC are as follows:
OS: Windows 10 version 1903
CPU: Intel i7-900k
Motherboard: Asus Prime Z390-A
GPU: Asus ROG Strix RTX 2080Ti-O
RAM: Corsair Vengance LPX 32GB (4x8GB sticks)
PSU: EVGA Supernova 1000 P2 80+ Platinum
Monitor: Asus ROG Strix XG438Q
Cooled with a Custom water loop from EK waterblocks (both CPU and GPU)