VLC Media Player: Jumping Volume Issue

Hey there,

I have installed the VLC integration and telnet add on on my HA pi to play media on the connected speakers.
Unfortunately I am experiencing a very strange issue: The volume jumps up and down all the time.
When I play an mp3 or wav file, the volume iterates between 100% and 0% ever 0.5 seconds or so.
This makes the player completely unusable.

Any ideas?

Thanks in advance!