Brand new AppleTV audio loses sync with video in any of the apps over time

I bought a brand new panasonic viera plasma and a brand new Apple TV. Video is set to 1080p and I have comcast cable internet. I have three apple TVs in the house. The other two are the 720P models. I've tried two new appletvs on new tv only and after an hour or so of viewing videos in any of the apps (hbogo,Netflix,Hulu) the audio loses sync resulting in me resetting the ATV and fixing the issue temporarily.
I didn't have this problem when I was using the 720p model ATV on the new tv.
Could it be the larger 1080P files?

does it happen with shared material in an itunes lib?
if not and only the internet streaming services then maybe it's a Internet network issue

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Brand new AppleTV audio loses sync with video in any of the apps over time

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