Spotify Plugin issue - clicks/cracks

Hi there,
found a “big” problem/issue, when using volumios Spotify-plugin:
Getting into own playlists works. Playing, too. When playing songs sometimes, when the next song starts, a clicking/crackling is hearable.
When using the Spotify-connect-plugin, there is NO clicking/crackling.
When playing songs via “Bubble UPnP”-app there is NO noise!
Tested both digital outputs: same issue on both ways! USB is NOT used for audio!
My Raspberry is a 3B+… Thought about not enough memory? Angry about possible damage in any device or Speakers…
By the way: “connect” sounds better…