[4.7.1] - Engine appears to causing a lot of CPU Stalls

I’m not sure if any of you guys have tested with the 4.8.1 release, but I am having this issue now occurring with both testing in the editor and playing as a separate build. It runs fine for a few seconds and then freezes my entire computer. I’m running Core i7, two GTX970, 32 GB RAM, haven’t had any issues with other programs, tested everything that I can think to test. Any suggestions?