I know its agravating - try controling the volume when it lags so much. By the time the volume lowers and you let go, then its all muted!

I've never tried other MX-3000s, Are the hard buttons on the newer ones "push" or "click" buttons?

Mine is a very anoying click, and with unresponsiveness, I have to click to change channels and volume one by one, otherwise, I will definitely pass the channel or the volume I want.