That sounds like interference from the wifi connection. Do you have many other close routers in the neighborhood on the same channel?Must be something going on with wireless as there are to many people having the same issues. Not sure why some do and some don't but there is no denying it there is something going on.
I was using the new Asus firmware on my 3100 and was watching my Roku 3 and had a disconnect during a movie. That has NEVER happened before. When i logged in the UI and went to the wireless device tab it showed all my wifi devices had all lost connection at the same time then quickly reconnected again never ever has that happened before. All has been good since but strange indeed.