I haven't seen this but I'm sure it's probably been posted, but I'm currently getting notification vibrations about every 5 minutes whether or not I have an actual notification.
Please try clearing the system cache and rebooting your device.
If issue persists, please send us an error report with screenshots from One UI Beta App (Beta Feedback -> Send feedback-> Error Reports -> "Select Category" -> Input frequency and Description" -> Send (Top Right Icon). We appreciate your help for supporting beta program.
