It is NOT a drop out.
Cubase stops and you have to start the song again manually
New here… I have this problem too, but mines doesn’t stop playing when i’m switching between tabs, it happens when i have a track selected, and it’s playing and when i select another track/vsti instrument track, the sound stops but the playback is still running. I have to stop and play it again. Its starting to become annoying. - Sorry for my rusty english -