FPS drops and No DLSS

Hey! I'm not sure if anyone has been experiencing this problem, but I've been noticing an issue where performance will worsen over a session. Typically I'll start off with 60+FPS, but an hour later I can visit the same area and only be getting 30FPS. This seems to worsen when I visit a new area for example Crossroads -> arlathan forest. I'll load into this area and be getting 20 FPS. However, if I exit the game and then reload it I'll be getting 40+ FPS? Seems to me like there might be a memory leak going on, or the game is trying to keep previous areas loaded. 

Another issue that's really been bugging me is that DLSS is not appearing as an upscaling option. I was able to use DLSS for the first couple hours of my playthrough, but then it disappeared as an option and now only AMD and Intel Upscaling are listed as available. I tried to verify the integrity of my files, which didn't help. At the moment the only way I can get DLSS is if I force it through GeForce Experience. However, if I restart the game this option will disappear again