I have been having issues for the last 2/3 weeks with my frames in game being extremely unstable, with it not going above 30 FPS in the menu's or during cut scenes in game. It is affecting the pace of the game, making everything jarring and laggy, and also causing me to suffer from speed up lag whenever I play online. 

Prior to these issues I was having no problems at all and the game was running smoothly. I hadn't changed any settings on my PC before the issue arose, so I have no clue what is causing this. Has anyone else suffered these same issues? Any suggestions for fixes? I have tried changing the config settings, DirectX version, Radeon settings and basically anything I can find at this point to try and fix it.

I have a Ryzen 3600 and a 5700XT which is more than enough to handle the game, with a stable, good wired internet connection and my drivers and game are all up to date.