My initial guess it could be due to my Spigen slim case has not been confirmed. I have removed the 1 mm of Cases compensate the rubber mat in the back again (rubber is about 1 mm thick), but it has not improved. Even without case, the problem occurs still.
Currently I have the power in suspicion. At various 230V plug power supplies in the apartment it loads properly, only in the car with 3 different cigarette lighter adapters it does not just work.
I'll stay tuned to the subject, may I get it anyway somehow out, because otherwise the holder is quite ok.