We have 18 XM preset stations. 6 on XM1, 6 on xm2 and 6 on xm3. I listen to the preset stations that are on xm1. When I turn off the car, I am listening to a station on XM1. Now, when I start the car, on occasions, the radio defaults to XM2. It should default to the station I was listening to when I turned the car off (XM1). I hope I explained this well enough. Does anyone have any idea why this happens? Thank you for your response.