Does the defect make you at a vague volume, at a high level, it always takes the same time to turn it off, when it goes off, the time to turn it off accelerates when you re-teach it? if at low volume it does not, check the baffles that are not affected or outside of parameters, if it still remains the same, check false in the power transistors, even so, I recommend that you put the equipment to work and verify that it is not reheat the board or any unusual component, in the front panel connector at the side there is a pin that is HOLD, it is being the aiwa protector, check all the equipment if you still do not see anything, disconnect the equipment, it should stop shutting down but be careful, there you disconnect the protections of the equipment, if instead of a false alarm it is really something affected when disconnecting that protection it may affect something, so check it well before disconnecting it. Personally, from my experience, always disconnecting the hold I have resolved, AIWA is delighted by that part. I hope you solve. Salu2