TV Goes Off By Itself-JVC AV-50D501

I have the JVC AV-50D501 projection screen TV. There are times the TV will go off by itself. I'll try to turn it on again over and over and it won't come back on. It can take up to one hour before the TV goes back on. Also, it does not happen everyday, it is very sporadic. I checked the sleep and timer and they are off. Can you help?

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