Very good, Dana; you're enjoying excellent sound despite the fact that you were "aware" that the Yamaha would shut down. Again this is an example that a problem shouldn't be assumed. It appears that the Yamaha is fully sufficient for powering your M80s at a sane listening level(be aware that if your "hard drive" exists for more than 4 hours that you should seek technical assistance)and that more maximum power capacity from a separate amplifier would make no difference at all if you don't venture into hearing loss territory. Your receiver delivers audibly flat frequency response with inaudibly low noise and distortion within its designed operating limits. Separate amplifiers or pre-amplifiers can't improve on that, regardless of price. Enjoy.

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Enjoy the music, not the equipment.