Bob,
that is a known defect in some of the Garmin suction cups. I think they had a batch of cups which literally glued themselves to the windshield.
The same happened to me and after exchanging a few e-mails with their (slow to respond) support they sent me a new one
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Originally Posted by BoxsterBob - CA
I had mine hard wired and mounded on the left, using the suction cup, but I recently went to move it to my wife's car, temporarily, and a chunk of the rubber cup broke off.
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