Alright so, here's the thing. Sometimes when I play Skyrim I can play it for ages without lag spikes and I've had a fun game. Other times when I play it, after every 10 minutes or so I get this lag spike that lasts for around 2 minutes. It's highly frustrating as it happens more than running smoothly. It never used to do this either. I run on Ultra, shadow details are on low. (because I found that increases FPS futher) I have 8GB RAM, my processor is a dual-core running at 3.4GHz and I have a Radeon HD 6790. Any ideas on what's causing the problem? I'm thinking it could be that my graphics card is over-heating, but it shouldn't be the case because this doesn't happen on any other game.