BMW i3 OBD connection loss

My vlinker mc+ is usually working with my android phone, but it looses the connection sometimes when approaching a charge point.

I tried everything I think of : restarting the phone, unplugging the vlinker, removing the bluetooth connection and try to relink it. In the last case, the BLE connection is successful, but communication with the car is not possible.

After a while when the car is powered down, i can link again the blinker and it works.