It seems you've overclocked both the GPU (Lightning runs at 930MHz @ default AFAIK) and the CPU. Drop the OC's first and see if it solves the issue. If it does, your OC isn't as stable as you'd think it to be.
Correction. The GPU runs at 940Mhz stock. I only increased by 10Mhz. The CPU runs at 57c at peak load. I ran some registry tests and found that there were a lot of registry errors. Also my hard drive was 47% fragmented. I'll defrag and fix the registry errors. I've been playing for two weeks now and only until the last couple of days have I noticed that the games were freezing.