So I was playing my fallout 4 at 1080p with fps never going below 30 and reaching a 50-60 inside or in empty spaces yesterday. Today I can't even hit 30fps anywhere! This is really irritating me and I want to fix this but I don't know what's the problem. I've lowered settings but that didn't seem to help and I don't want to start playing at a lower res. My gpu is the gtx 560 ti core clock overclocked to 940mhz.