[ez4]

Hi Guys,
I am brand new to BMW's, having just purchased a 2006 z4 3.0L. I had an aftermarket Sirius Edge Radio installed which plugs into the aux adapter. The only trouble is after playing for a few moments, the "aux" disappears as an option on the radio and Satellite Radio sound cuts out (The Satellite Radio is still on) and the radio returns to playing either a CD or regular radio. (I also have an aftermarket GPS hard wired into the car in case this information helps.) Does anyone know why I'm having this problem and how it could be fixed. I don't know whether to take the car to the place that installed the aftermarket Satellite Radio or back to a dealer. Thanks in advance for any help.