Hi I have been using an ATV2 for a couple of years with no issues. I picked up a new ATV3 when I was in the States last week and have now experienced issues with the sound stuttering on playback of hand-braked movies. It starts to occur after I have been using the ATV3 for about 1.5 hrs. If I put the ATV3 to sleep and then resume playing the issue goes away. Any thoughts on this ?