Safe Mode disables other messaging apps and MMS, so I was not able to keep it in Safe Mode long enough to experience the issue. This is definitely an OS or a Samsung system app issue. You will find others experiencing the same issue across the internet. Selecting a notification or ringtone temporarily fixes the issue. I appreciate the fact that you are trying to troubleshoot, but I have given up. I decided to take a loss and ordered a Pixel 5 last week. A long time ago I swore off Samsung phones, but I figured I would give them another chance. This just isn't worth it to me. ... View more

I will spend the afternoon in Safe Mode and see what happens. All notifications for all apps. ... View more

Thanks for the suggestion. I have already tried this multiple times in the past, but the issue continues to occur. I have also tried Resetting All Settings with no luck. The issue occured twice within hours of doing the reset. ... View more

I am having the same issue on the S20+ 5G.  Notification sounds are on and working fine, and then suddenly no notification sounds will be played.  If per-app settings have vibration on, the notification will still vibrate.  A temporary fix is to go into sounds settings and select a ring tone or notification sound, even if it is the same one already selected.  Because this temporarily fixes the issue, it is clear that this is not due to user error.  Either there is a system-wide issue or a misbehaving app.  Bug reports via the Samsung app are getting me nowhere.  They just respond with generic responses or tell me that my issue is unclear and the bug reports don't show anything. Between this issue, the lack of visual voicemail on Google Fi until recently, and the weird wifi issue on mesh networks due to random MAC address settings, I also regret going with the S20 over a Pixel 5 after owning a Pixel 1 and 3.  I'm considering eating a couple hundred bucks and switching back to something a little more reliable and predictable, or maybe wait it out until the Pixel 6. ... View more

Thanks.  I saw that.  I have 3.0.54.0 from Feb 9, 2021 and am still encountering this issue.  I have data cleared on Bixby and do not use it.  Frustrating. ... View more

I am having the same issue on the S20+ 5G.  Notification sounds are on and working fine, and then suddenly no notification sounds will be played.  If per-app settings have vibration on, notification will still vibrate.  A temporary fix is to go into sounds settings and select a ring tone or notification sounds, even if it is the same one already selected.  Because this temporarily fixes the issue, it is clear that this is not due to user error.  Either there is a system-wide issue or a misbehaving app.  I do not have the Galaxy Wearable app installed. ... View more