I have a Harman Kardon AVR 110 receiver, this is the first problem I've had with it.. On certain channels 3/4 video channels, cd & dvd, the volume buttons are not working. The volume is fine, manually with the volume knob, and the buttons work on other channels, video 4, and FM/AM. I'm unsure what setting would be locking the volume buttons on the remote on these channels. Any feedback is appreciated. It'll probably be fix itself once I submit this question.