Sorry to hear this, but I'm not surprised given what I've read on this BavSound package. Most people have said the same thing as you….

What year is your X5 BTW? Do you have the legit 'base' sound system (S645A - BMW US Radio) or do you at least have the 'Hi-Fi' sound system (S676A)? In 2012 BMW ditched the 'base' system (S645A) and every X5 got at least S676A (Hi-Fi Speaker System), unless you opted for the Premium Sound Package (S677A). I've done no research on pre-LCI models, but I do know 2011 35i's without Premium Sound have the 'base' system (S645A) which I've heard, and it's terrible. If you have a 2011 50i, or a 2012 35i or 50i, you don't have to worry about this awful sound package even if you don't have the Premium Sound Package. Hopefully that made sense…