S21. I don't know if the following problems have a root cause or variable causes.
1) I have a number of apps (e.g., Gmail, Messages, Reminder, Ring) that work sporadically. They'll give notification sounds for an hour or so, sometimes just a vibrations, usually nothing. I can reboot and get some of them back for a while.
2) Gmail has a unique sound, well, all apps SHOULD have a unique sound. Gmail does. Reminder, Messages, calendar have unique sounds assigned, but all give the same notification sound when they actually sound (see problem 1).
3) I can go to any app, select notifications sound, scroll to the one I want, touch it and . . . nothing. Silence. I can touch the sound already selected sound . . . nothing. My phone does give audible phone rings, GMail notifications, and a few others, but the sound selection screen . . . nothing.
How do I resolve this. Been this way since I bought it