[LAU] every first startup of jackd1 with motu ultralite AVB unsuccessful

Hi list, starting jackd1 after connecting a motu ultralite AVB sound card throws below error. The second startup attempt works then. What could be wrong? How could I debug this further? Thanks! Peter /usr/bin/jackd -dalsa -r44100 -p64 -n2 -D -Chw:AVB -Phw:AVB -i24 -o24 connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory) attempt to connect to server failed connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory) attempt to connect to server failed jackd 0.125.0rc1 Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details JACK compiled with System V SHM support. 12:55:29.917 JACK was started with PID=23950. loading driver .. apparent rate = 44100 creating alsa driver ... hw:AVB|hw:AVB|64|2|44100|24|24|nomon|swmeter|-|32bit configuring for 44100Hz, period = 64 frames (1.5 ms), buffer = 2 periods ALSA: final selected sample format for capture: 24bit little-endian in 3bytes format ALSA: use 2 periods for capture ALSA: final selected sample format for playback: 24bit little-endian in 3bytes format ALSA: use 2 periods for playback ALSA: cannot set hardware parameters for playback ALSA: cannot configure playback channel cannot load driver module alsa 12:55:30.792 JACK was stopped 12:55:32.096 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info. connect(2) call to /dev/shm/jack-1000/default/jack_0 failed (err=No such file or directory) attempt to connect to server failed