I know this has been discussed in other BMW forums, but not specifically about the X5.

Problem: Since getting the car 4 weeks ago the Sirius satellite will intermittently stop working, the radio will fix at channel 255 with no sound. The display will show the available stations but nothing happens when a station is chosen.

The issue never occurs in the morning after vehicle has been off for the night. Usually, but not always, occurs after parking the car and re-entering after a short stop.

Once it occurs the only way to try to get it back is to turn off the car and park it for 15-20 minutes. May or may not fix it after restart.

I've read that some people with other BMW's who have the same issue will leave the key in the car for 30 seconds, allow the satellite to acquire, and then turn the engine on. I've tried this and it works 80% of the time.

My dealer has no clue what this is and asked me to bring it in when it happens. Drove all the way there, satellite "acquiring" for 1/2 hour, parkewd the car for 5 minutes, dealer comes to see, car turned on, satellite works normally. I feel like Lou Costello......