I have a second gen Apple TV. My router has a 2ghz and a 5ghz option. the 5ghz is MUCH faster on my phone and macbook. However, whenever i try to airplay to my apple TV, it only works on the 2.5ghz. When i try to used the 5ghz, only the sound transfers fine and the video is black/shows one frame of my screen then freezes(while the sound still plays). Any ideas as to what is wrong? Thanks!