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Philips FWC780 loses sound but comes back after power-off

Just recently (about a week ago), my Philips FWC780 loses sound to the speakers after 5 minutes to 25 minutes or so (it just depends - could it a heat related issue?) but it still has power and the power ouput/volume meter moves and all the lights stay on and I get sound from the headphones if I plug them into the earphone jack. But if I turn off the power off for a while (the length of time has varied but usually it been 30 minutes to a few hours or up to a day or more), the sound comes back. But then the sound goes off again. Don't know what to do - is it time to get a new system or get this fixed if possible? I tried finding a similar system on-line but haven't been able to find one with the cassette recording capability and with the RCA analog audio output jack and same size and power. Thanks.

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