Hi there, I have the Denon AVR 3313CI receiver which has been great to date. One thing that just started happening is that when I try and turn the receiver off with the button on the front of the unit it just toggles between main zone on or off when tapping the button. This used to turn the unit off so I'm not sure what went wrong. At the moment I have to unplug it to power it off which is a bit of a nuisance. Any suggestions? Many Thanks.