I got home tonight and went to turn the TV off and it turned itself back on again. I tried the remote and the power button on the set itself and it just turns back on. I even tried using the TV's timer to try to turn it off and it was no good. I unplugged the set for about 20 minutes and as soon as I plugged it back in it turned on. What's the deal? What causes this? It's an analog 36" Toshiba that's about 5 years old.