Yeah, mine does that everytime I go over a speedbump or small pothole, etc. Very annoying. I need to get it fixed, but too lazy and cheap to get it done right now.

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01 X5 - "All black everything" - current
Eibach Springs, 20" 87's staggered, 4.6 kit, DICE, Angel eyes

00 328ci - Silver on Black - current
Eibach Springs, 18" Hartge, LED tail lights, K & N

01 ///M5 - Gunmetal with Black and Red interior -retired
Eibach Springs, 19" Breyton, Dinan Exhaust

99 540i - White on gray - retired
Eibach Springs, 19" Hamann PG II, Angel Eyes