You may just need to tweak your cache & RAM settings. I had similar issues here, and I just juiced the RAM to 4096 (that's 4 GB, a number I chose arbitrarily).

You may just need to tweak your cache & RAM settings. I had similar issues here, and I just juiced the RAM to 4096 (that's 4 GB, a number I chose arbitrarily). Haven't had an issue since.