This is my second Panny. My first succumbed to the "purple snakes" and Panasonic replaced it with this PZ85U. Recently, DVD's played through HDMI have begun to occasionaly exhibit severe jagged horizontal lines during moderate movement of objects in the scene. I noticed it a while ago, but only rarely. Now, the problem can occasionally be so bad as to render some DVD's too unpleasant to view. One example, if I were fast forwarding a DVD, the image would have severe jagged, thin black horizontal lines, and when I resumed normal speed playback, the black lines would continue during scenes of motion. But, if I reviewed the same passage again, it would be normal, sometimes "popping" back to normal during playback. At first I blamed the DVD player, but I duplicated the problem with a brand new Toshiba, using a different HDMI cable and different input. What is different with the way the Toshiba caused the TV to act up is, if I played a DVD and hit "setup," (the player pauses) but then did nothing else but exit right back out of setup, the severe, thin black lines during motion appeared every time. If I then stopped the player and resumed, no more venetian blinds. Either player is doing this more and more, to the point where I now can see faint, almost scan line-like horizontal lines during much of my SD DVD viewing. Today I believe I also noticed it briefly on OTA broadcast. I'm clearly not the expert here, but could this have anyting to do with "3:2 pulldown," "deinterlacing problems," etc? It seems like something is intermittently not "locking" into place during input signals. It is clearly the TV's fault, it is getting worse, and is appearing on DVD's I've previously not had issues with. The set is a few months out of warranty. This makes two defective Panny's in three years for me, so Panasonic is not on my list next time around. I truly appreciate any input and suggestions you might have regarding causes and cures for this issue.