FWIW, the supercup that came with mine is tight, not a wobbler. But I decided to use the normal suction cups so I could mount closer to the ceiling.
I had problems with mine as well. It was doing exactly what yours was and then broke at highway speed. It broke after a month of use. I was offered a replacement but refused as I suspect other will have the same problem. I was told on the phone that Escort does not make it and we cannot be responsible as well as why are you calling. Very unhelpful. I decided to go with a RVM mount so that it cannot be seen from the outside.
My new one seems to be holding up so far.
Just made a trip of 1,800 miles.
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