Problem with mute switch

[TimmerSuds]

I frequently use the mute switch to disable sounds on my iPhone 7 when attending meetings. Quite often, when I unmute it, the notification sounds on my email and text messages remain muted until I power off and restart the phone. The ringtone will work, but not the notification sounds.

Is there a fix for this?

 

[Newtons Apple]

This might be a iOS10 bug. I do not ever use mute so maybe other can say they see the same

 

[T5BRICK]

My phone is almost always muted, but when I turn the mute switch off, notifications seem to come through just fine.