LinuxMusicians

Now I found a workaround. Thank you falkTX. I had to install cadence in ubuntu studio, so I have the posibility to start a bridge from pulseaudio to jack. An set Clementine to use pulseaudio. Now Clementine is not in the connection from jack. The source is now puleaudio. And the connection never get lost. But I do not like very much this workaround. Bridge from pulseaudio to jack its a bad solution. But it works.
Peter