Dash pro "left" does not work properly


after taking the dash pro out of the charger and fit in the ear all works well.

It is possible to switch to transparency and to windshield.

A little bit later this is not longer possible.

when I come back after 1 or 2 hours (in this time dont work) I put in the charger.

After new installing in the ear transpareny and windshild wor, then after some minutes dont´t work any longer.

One posibility is to switch in the app on the iPhone the transparency and windshield.

who can help?