Audio glitch

[963Delta]

On my Lumia 521, whenever I play music and try to change the volume it doesn't change, it can go to zero and the volume will stay where ever you left it.
Any one know how to fix it?

 

[kwajr]

It's a long standing bug must reboot

Posted via the WPC App for Android!

 

[963Delta]

Already tried a soft reset but the problem continued.