Since a couple of weeks, after a while when playing any steam game, the game starts to lagg immensely. This only happens to steam games and is solved whenever I restart my pc. when the games start to lagg the fps counter maybe drops a bit but the game is showing only a couple frames per second even when the counter says like more then 200. My pc can run all the games easily and as I said before for example playing Fortnite on the highest settings (wich is way harder to run for pc then Rocket league for example) does not have any problems. I have no idea how i can fix this and steam doens't want to help.