So first off, this doesn't happen that often. In fact, it's almost random, but whenever it felt like my PC was delayed in playing video games or stuff, I would do a ping test on the PC and my other devices (MacBook Pro and iPhone). I had 700 ping on my PC and around 12 ping on my MacBook and iPhone. Could something be wrong with my wifi USB adapter? It's a Panda Wireless PAU06 300Mbps N USB Adapter that I bought on Amazon a couple months back.