Severe FPS Drops (5-10 FPS) in every game mode, even in Menus

• I played 50 mins of a UT match today, and randomly around this time the game dropped to 3/4 fps, severe input delay and was unplayable — i ended up locked in a menu unable to leave it. My internet was fine throughout this period of time and task manager showed my PC was performing as it should. 

I tried to send a video of it, but the forum page is having an error with that too…