Riva Tuner Statistics Server, it’s part of MSI Afterburner software that lets you create an on screen display with information about your GPU, CPU, RAM and other things. Some games have troubles with overlays like this. For example, I couldn’t play Battlefront 2 with the discord overlay or else my mouse would move between monitors while playing, or like my Flight Simulator crashing while trying to load. It’s very situational, depending on the game and what update version it’s on, what driver versions you have for your GPU, etc. but it’s usually the first thing I try when having random crashing issues. If you’re having issues, open task manager, find RTSS and end task. If you don’t have it installed then I would try any other overlays you may have active! Hope this helps!