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Yep, a bunch of us have had this happen. Usually occurs if you drive through a puddle at a decent speed. In my opinion Tesla needs to redesign this part and issue a recall. There’s a fairly lengthy thread about this issue: Ripped Undercarriage Composite from the rain?
You can probably avoid a service center visit if you’re the DIY type. Just buy some very strong water-proof tape and tape the loose piece back in place.