Music volume gets extremely loud when changing songs -Seat Leon

Hello to each other, I have an interesting problem with my new Seat Leon FR (with the Beats audio system) that I already know from the new VW Polo. When I play music via Bluetooth, it happens irregularly that the same music is only quieter than usual at the same volume setting at the beginning of the ride, and as soon as I jump forward a song, sometimes the volume suddenly becomes “normal” again. That happens, for me completely arbitrarily, often during this ride. But there are also rides where this problem simply does not occur at all. I already thought that it is connected with the speed-dependent volume adjustment.. but no matter whether I set it to min. or max., the problem remains. I hope you can understand my problem and a nice seat owner knows a solution, probably it is only a matter of attitude ^^ ́ Thank you in advance!