Default push2tv + pioneer avh-8500bt Miracast

Hi

I have a pioneer avh-8500BT and a LG G2 and a netgear push2tv using micrast to push out image

At home I can connect my G2 to push2tv no problems
In Car with my headunit it connects but i get a blackscreen. In portrait mode i get image but it flashes, in landscape no image. Interestingly when I press the back lock button i see the image regardless how I am holding it.

Tried a Samsung s4 in the car and worked first time.

Any Ideas??