HELP! Wired problem with sound system

[Tamer]

What's up X5 fans?

I'm writing because i'm looking for help regarding a strange issue I have with the BMW Business CD that my car is equiped with. Sound quality varies incredibly from one start cicle to another. It's hard to explain but my car seems to have 3 ways of playing my music back:1)Horrible sound quality.Speakers rattle, volume is low, no kick from the bass; 2)Decent quality. Vocals are distorted, volume is close to good and the bass is nice to; 3)Incredible sound quality. Incredible sound, the mirrors move when the bass drops and volume is amazingly high without any noticable distortion.

I can change from type 1 to type 2 by simply restarting the radio.It seems that it's periodic or something. Bad,Good,bad.... you get the drill.
Type 3 comes rarely usually when I expect it least.It's more closely related to starting the engine. Today i was driving with my girlfriend and she asked me if I changed the speakers on the car. The sound was that good.

What is faulty? The Mp3 CDs are properly burned(Heck i only have one cd in the car)and the speakers seem ok. I took the stereo out and unpluged the cables and then put them back in but still no luck.

I plan on upgrading the sound system but if i can get it to stay at the increbile sound quality phase i might reconsider.