I installed a Polk XM tuner for one of my clients about 6 months ago or so, and we have been dealing with issues for quite some time. The problem is that the XM unit will default back to Ch. 1 periodically.
The unit is part of a whole house audio system and is never turned off. I am using Universal Remote Controls MX850, and have made it so that he can not change from preset to direct entry mode and none of the presets will go to channel 1, so it is not currently possible to change to ch. 1 if he wanted to without going to the unit or getting out the factory remote. Once the unit goes to ch.1 you can't change it unless you power down the unit and then back one.
Any ideas of what could cause this? Defective unit?
World of Sound & Vision