When I turn it up, it turns down

That's one sweet amp you have there! I believe the volume control is micro-processor controlled. If you haven't already try powering down the M3 completely (not standby by mode). It may be the processors in the amp need to be reset and powering down would do that.

Cheers,

Scott

That may be some type of protection. If you try to turn the volume up too fast, the unit may be programed to think it may be an accident, and is set up to not harm your speakers. I think I remember reading about a feature like that, but to be honest, I don't recall if it was NAD, or some other brand.

Try unplugging your Nad for a few minutes. Plug it back in and see if that solves the problem.