Mute/Audio Issues

I'm having problems with muting on calls but cant find any references to this elsewhere.

Since the last security update (Canadian S8+) my audio is all a bit out of sorts, including:

Trying to change volume changes in call volume when I'm not on a call

Muting sometime doesnt work (bad for long conference calls)

When it does work, sometimes I cant unmute and need to hang up and rejoin the call

Any thoughts on a potential fix? Is anyone else experiencing this issue?