M200's in Music Mode

Hi all. I've been enjoying my new pair of m200's for the past few days and have noticed that they take quite some time to go into standby mode (about an hour). I'm curious to know if others with these amps also have this long a delay or is it shorter for some.

I have mine in music mode as well. They do seem to take some time to switch out. What gets me is that they will randomly come back on after that. It can be just one of the pair too. Sometimes a very low buzzing noise will be emitted from the speakers. Because of that I have to power them off.