I had similar issue when gaming, especially csgo. Noticed it would take ages to connect, would get high ping warning before looking for matches, sometimes disconnects etc. I found that by disabling the wifi adapter of the ASUS ROG Crosshair VIII Hero...
I have the same board, and noticed one of the fans going 100% for some reason. I have a Kraken Z63 cooler and some case fans. After checking them all it seems this one PCH fan is the one thats randomly starting up at and running at 100%. Occasionally...