I had the same issue as a lot of you have mentioned & I was going to silicone caulk the track - thinking water was leaking around the metal frame onto the bathroom floor. I discussed the problem with the service manager at my dealer. He immediately pulled the faucet off of the wall, unscrewed the water supply pipes from the back of the faucet and applied teflon tape to the pipe threads and screwed everything back together. In addition, he applied silicone caulk to the back of the faucet plate and reinstalled.
The service manager mentioned that he was seeing a lot of these phantom water leaks & you might not see the water on the floor any longer by caulking the metal frame or the tub perimeter; however, the problem has not been solved & moisture mildew will happen behind the shower.
It was really simple to remove the faucet & make this repair. When he pulled the faucet plate off, it was noticeable that the pipe threads were wet and this was the cause of the water leak on the bathroom floor.
My 2 cents - might be worth looking into.
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