Home Theater Questions? Ask a Technician for Answers ASAP
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I think that you might have a problem with the on-off switch, perhaps. It might not be fully opening owing to defective contacts or a defective internal spring, resulting in its contacts coming together again, at any slight jarring or minute vibration.
It also might be subject to power surges and spikes and unusually sensitive to them. So try powering it through a surge protector. (If you have already done so, check the ground connection on your outlet(s), to make sure voltage is not riding on them, or to make sure that the ground on your outlets is still actually connected to ground.)