I realize this is an old post but YES, I have this problem too. MSC-400 and MX-980 combo and up until last night mine only stuck with a volume up or down (NOT GOOD WHEN IT'S VOLUME UP!). Last night it happened while scrolling the Denon setup menu. I've tried changing things like using triggers instead of IR code commands but it makes no difference. It happens about once or twice a month and I know for a fact it's not a stuck remote button. Has anyone got a fix?