I use Do Not Disturb on a schedule, no problem. However, this morning, I turned it off manually, but I'm still not getting any sound/notifications etc. So no sound on Facebook videos, no sound from Music Player etc.
No sound notification from cal;ls or messages, but vibrate works.
Definitely not connected to any other speaker.
I do have exceptions set up to allow calls from 'favourite' contacts, so I tested this and the call came through with audible ringtone.
When I reboot the phone, the DND icon would still show, and switching the DND off again had no effect.
Now the time has gone past the automated switch off setting, so the icon no longer shows, but still no sounds.