I think I wrote a follow-up in another thread, but in case someone comes here...

Winter in Wisconsin seemed to cure all my roof problems.

I think what happened was that while in South Carolina I had the car detailed. This was a week or so before the roof stopped working.

I think the wax from the detailing - along with the 105 degree temperatures "sealed" the roof by cutting down on the space available for heat expansion. After moving to Wisconsin in October, the roof started working correctly again.

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2006 X5 Sport 4.4i