How to fix Panasonic plasma tv?

There are a number of things that may be wrong. If it happens repeatedly, then chances are that a loose connection or poor weld is becoming disconnected when the TV heats up. The motherboard in the TV is probably the culprit. If the TV is under warranty, have it repaired. Otherwise, call the manufacturer helpline and ask them how to diagnose the problem. You can also call a local TV repair shop for an idea of what is going on and what it would cost to repair.

it might also be your capacitors. if your tv is not under warranty, you can fix it yourself. a quick removal of the back panel can show you whether the caps are good or bad.