Bluetooth connection with Porsche PCM does not work

[Alexy1]

When I play a playlist  with  my android mobile phone ( xperiaz3) on my  Porsche PCM Entertainment sytem ( connection via bluetooth) the playlist starts to play but after every 15 seconds the next song is played resp started. With my old mobile phone all playlists played regular but since I connected my new monbile the same problem starts with every playlist. Does anybody know what I can do ?

thanks 

Alex