HTC M8 - Notifications Mute

[AC Question]

My notifications sound (only) has been switched off. Normal profile is "on" but the notifications volume symbol is crossed out on the volume screen and I'm not able to turn it on. I've tried checking and unchecking "Use ringtone volume for notifications" but no change. It vibrates only. However, Ringtone, media etc is all fine

What's strange is that after some 5-10 minutes, the notification sound is back again. Is there anything specific that's causing this strange issue?

 

[Golfdriver97]

Welcome to the forums.
I would try clearing cache in recovery first. Here is how: http://forums.androidcentral.com/ht...ow-reboot-into-stock-recovery-htc-one-m8.html