Http://www2.panasonic.com/consumer-electronics/support/VIERA-Plasma-HDTVs/model.TH-50PZ80U
http://www.freeservicemanuals.net/user.asp?m=mariocardelli&page=4
Use these downloadable service manuals to troubleshoot your problem
PANASONIC TH-42PX50U video and audio cuts out for couple of seconds on hi-def channels only.
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