Random Stuttering

So I downloaded the Witcher last night, and had no problems, today, however, every like, ten seconds or so, the game freezes for a few seconds, my specs -Gigabyte GTX 960 Overclocked Edition 4GBVRam -Intel Pentium G3258 -8 GB of Ram I'm using the Nvdia optimized settings but it keeps freezing, any help?