Anyone having an issue with their remote radio control, pressing it as "Source" does flip thru the XM, FM, AM, etc, but as far as the up/down arrows, it does the same thing. If FM is selected and I try to bump it up to the next station, it just selects another source, seems flaky as sometimes it partially works. Does allow me to move on to different XM channels sometimes. I think it's defective. Am I doing something wrong?