Is USB midi out working right now or not ? (sending track data)

Midi-Out works - for me only via Midi-port or Midi-USB. Just checked 5 channels simultaniously as inputs for instrument tracks in my DAW. USB on DT is diconnected, Midi-clock including start-stop-commands are accepted, timing is straight on track. As long as you prevent any manipulation, such as channel switching or DAW-internal processing, the DT runs stable for quite a long time. So far I’m not quite sure if this sudden freezing ‘out of nowhere’ depends only on incoming Midi or any other OS-action, such as copy & paste.