I've the lastest software/firmware on everything (iphone 5, apple tv2 and PC). Most of the time, Air Video works perfect; but when I watch a Blu-ra quality movie (12GB mkv file) with highest Air Video settings (10 Mbits/sec), Apple TV restarts itself in every 30 seconds. I can keep the movie playing on my iphone. So the issue seems to be related to the Apple TV. By the way, Air video tests my connection speed around 32 Mbits/sec.