first off, this is an October 2011 Panasonic TCP55Gt30. This started about a week ago and it only does it on the upper portion of the tv. First I thought it was in the HDMI cable. I've tried 3 different ones and still the same. I then tried a different HDMI port on the TV to see if there was a connection issue. NO change. Upgraded my Direct tv DVR to the Genie and no change (not because of the issue. Just happened to be scheduled), so it's not my direct tv box. I played a movie via my oppo blu ray and it's there also so it can't be the satellite signal. Everything runs through my receiver to my tv, so I thought maybe it was the switch in my Onkyo. I then ran HDMI direct from my Directv to the tv to rule out my receiver and no change. It doesn't do it all the time, it's intermittent, but getting more frequent. It's not noticable when watching most movies since the black bars hide it, but when on full screen it's visible and driving me nuts!! It has to be in the tv itself since I ruled everything else out. Anybody have any ideas?? I have a 5 year plan on my Panasonic. Should I make a call?
oh. and it's not one channel. you can scroll through all channels and it remains while the issue is happening. You can even replay a DVR event that didn't have the issue originally, but it will be there when replayed. HAs to be in the screen itself. TV only has one HDMI attached to it and everything runs through a monster power conditioner.
Just giving as much info as possible.