I have had this receiver for sometime. But recently - I can't turn the receiver on and off - with the remote control. Can't change channels - new batteries etc. So tried to turn the receiver off and on from the receiver - and nothing worked. couldn't not change channels either. I unplugged and did a reboot - and things will start working for an hour or so....and then everything stops. Hope someone has some suggestions...as this is the main receiver in my living room. Thanks for any and all help.