Hi,
Check the soft start relay circuit at power supply, take apart the top cover and try to hear a click a moment after you turn the amp on, if it doesn't there's your issue, this amps fail a bit much of this soft start circuitry, the second possibility is to clean thoroughly all back switches, the white ones that you have to push in-n-out, they get dirt easy and cut out the music, let me know more to help you more...
Check that the cooling fans are working. if they are not then you are probably triggering the thermal overload protection.
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