I have a three year old 50 inch HD Panasonic Plasma TV that has begun to lose sound and picture about every two minutes. Any ideas on what could cause this problem?

What is the model number?

Is sound and video cutting out completely to the point where you need to shut the TV off and turn it back on? Or is it just cutting out for a split second? When it cuts out, are you able to pull up the TV menu (make sure you use the TV remote, and not your cable/satellite remote)?

Does this happen on all sources? What do you have connected to it, and how is it connected?

Have you tried unplugging the TV for a bit and plugging it back in? How about updating the firmware?