Properly matching, but still not ok

I have very carefully applied the film; deducted the delivery sheet and placed directly the Vikuiti film.
Fit perfectly and I was initially very pleased.
Tapping and wiping working absolutely trouble-free.
Until then, I wanted to use the Navi function in the car:
Once I had the iPhone in the car holder, the tap and wipe no longer worked. Only when I touched the screen at another location, was the function - almost - fully ok.
Closed with the sync cable, the display was used without restrictions.
I have complained about the film and get sent to replace the Vikuti ADQC27 and reared.
This works fine, but is not so perfectly in the DQC-160th

What is also at fault in the DQC-160 but still, is the formation of spots on the film, which is really extremely unsightly and reduces the initially very good visual impression sustainably.