All of a sudden SOMA doesn't run good anymore

[Lantlos]

So, I've been playing this game for about 3 hours, and the last couple of days it ran like a charm with every single video setting on the highest possible. No fps-drops whatsoever, it was a real smooth experience. The day before yesterday I started the game and I noticed that the performance has dropped quite a bit. I don't think I'm even getting 20 fps all of a sudden.

I tried verifying the cache, reinstalling, tried lowering settings, my drivers are updated. It's just out of nowhere that the performance has dropped.

I'm in the stranded boat underwater section looking for a liferaft to go to Theta, if that helps.

Specs:
Intel i5-4570 3.2ghz
Nvidia Geforce 770gtx (latest driver version 355.98)
Memory 8 gb RAM