I do have the same problem. I tried with three different phones (Cat s60, Samsung S7, BV 6800 Pro). All working except the BV. I did various factory resets already and I am using the original cable. I also tried one of the well working cables from the other phones with the adapter, same behaviour. BV restart, as described by Marcus71.
Car is Mitshubishi Pajero with recently updated car entertainment system and, as mentioned, all others work.
I would not have bought the BV it I had know about this issue. What fix can you offer?