I bought the th-58pz700u 1- ½ years ago. The other night while switching the channels on my HD sat receiver I notice that when you go from certain channels to another the picture will shut off for a split second then come back and display the input that the TV is on. It won't do it every time, just certain channels you change to, and it will always do it when going from a standard channel to a HD channel or vice-versa. The TV seems like it's having trouble locking in the channel normally. Has anyone heard of this happening?