After the update 2 days ago I noticed the vibration alerts and etc would randomly stop working unless I open setting and change the vibration pattern. It would happen 3 or 5 times a day, sometimes I have the device on vibrate mode and it wouldn't vibrate which caused me to miss calls or important message.
PS I have everything properly set up. Everything worked fine before the One UI 4.0
That's one of the problem I can't do it coz I don't have a PC, I read to access the Cache partition you need a PC for the volume up and power button thing to work..
Open Settings - Tap Notification - Tap More under Recently Sent - Tap More Recent - On the dropped down Tap All - Then Tap the 3 dots on the upper right corner - Then Tap show System Apps - Look for Android Systems Tap it - Then Notification Categories - Look for Alerts tap it - Then Toggle on Vibrate
Last power off device wait a minute or 2 then power it back on. That should fix it.
Apparently after the update that toggle on the Android system turned off.
