It started just a few weeks ago. I noticed that my notification sounds would mute and I would miss messages and various other things while it was muted. I always go into sounds and pull the bar for notifications back up. It sometimes does it multiple times a day, other times just the one. I've restarted the phone and even gone as far as a factory reset, which worked for a day but then returned. I've had this phone for maybe two years and I've not had the issue until now. I've tried contacting support about it but all they tell me is to restart the phone for a temporary fix. The device is currently up to date. Smart Things is off. Do Not Disturb is off. Bixby isn't even set up. What's going on??