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Check that you have not got an auto power off setting on. Check that the aerial connections are good. That the signal is strong from the stations it is picking up. Weak signals can cause the box to shut down.
It the box is very hot when it shuts down, you might have a fault on it.
Looks like you got a bad converter. I have the same kind and it is a pain that you can't use the remote to also control the TV. It will turn itself off after 2 hours by itself if you do not change the options, but the symptoms you describe are beyond consumer repair.
Do you still have the manual? There is a toll free number to contact them and ask for a replacement. If you do not have it I can provide it tomorrow. (I am not at home right now.) Of course you can only get one of the same converters.
This TV probably needs the convergence amp IC's replaced. When they go bad the TV will not turn on.Call a good TV Tech and tell him you want the IC's upgraded to STK 392-150 instead of the original STK 392-120 and check all resistors in the circuit for proper value. They could be burned or open.