Well, I’ll try to explain:
I’ll work as I usually do. Then, something happens and everything stops sounding. However, I can see the visual audio signals.
I try to change the audio driver but it doesn’t sound with any of them.
The only way I have to make it sound again is closing Cubase and opening it again.
Still, the sound signal of the CONTROL ROOM hasn’t been compromised. I think that Cubase has two audio signals, the Control Room and the main sound signal. I usually work with the Control Room disabled.
When the sound has died, if I enable the Control Room I can hear the music again (but with FX or strange things, but this isn’t important in this case). However, enabling Control Room doesn’t solve anything, the main sound signal still doesn’t work.
This issue, combined with the Expression Map/CC bug has make working with Cubase 10.5 into a nightmare. However, I think this is an older bug.