This problem has me confused. Our main unit is a R15-300, after about a year the #'s three , six and nine, stopped working on the remote. Order a new universal Rf ( since I wanted the back light) Same thing happened to this one, same numbers. Ordered a second plain $15 remote, same thing with this one but this time we upgraded a second room to a HD-DVR took the remote from the old D11, which was working fine and has lasted about 3 years to use with the R15. Guess what after about 3 months I'm seeing the same thing happen. Could it really be because of my usage or could some sort of feedback/interference issue be the cause ? The IR receiver in our Toshiba TV did die right before we switched to satellite service. Could this have any effect on the remotes ? I can't believe I burn out as many remotes as it seems.