On my Mate 20 X, in Settings > Sounds > Notification, if change my default notification from Whistle to something else, after a few hours, maybe less, it changes back to the Whistle sound. If I reboot, this also makes it reset to the Whistle sound. I checked for software updates and it says "Your software is up to date". How can I make it keep the sound I choose?
Device Name: Mate 20 X
Build Number: 220.127.116.11 (C636E3R1P11)
EMUI Version: 9.0.0
Android Version: 9
Best answer by benodiktine
The steps I followed we're under the section named "Reset app preferences to reset notification and ringtone picker"
For my phone it was a little different, I went to Settings > Apps > Apps (this is the difference, there's an "Apps" inside "Apps") > vertical ellipsis > Reset app preferences.
After doing this, the problem was gone so I knew it was an app causing the issue. I narrowed it down to an app called Sound Profile which had the "whistle" notification sound set, I changed it to what I wanted and all is good now. So it was not an issue with the phone. The Sound Profile App was set to use a specific sound and that was the cause, not the Apps fault but I don't know how or why it was set this way.