Found the culprit: another app with an audio engine in the background can connect to the driver and disconnect Cubase from it.
Now I run Cubase making sure no other audio-related app is running in the background.
Found the culprit: another app with an audio engine in the background can connect to the driver and disconnect Cubase from it.
Now I run Cubase making sure no other audio-related app is running in the background.