With my 50s HK after the firmware update 2.1, when i have a mesh intercom on, the level of the volume appears in the TFT of my BMW when the mesh is open and appears again when return to listen music. So the volume level indicator is showing and showing all the time. I think this is because the sena have two differents volumen setting, one for the music and another one for the mesh, so when the sena change between this two modes present the level in the TFT screen.
This appeared after the upgrade, and its important clarify, the wonderwheel is not manipulated y anytime.
I hope you can fix this issue in the next firmware release, I will really appreciate because is too annoying