Has anyone experienced an issue with their volume not changing? I saw one post on Microsoft site. I have a Lumioa 810 and when listening through Music + Videos I'm unable to change the volume. Where ever the volume is when I start listening to music it's stays there. For example if it's at 15 and I start listening to a song It's stuck there. Raising the volume up or down does nothing. Anyone experience this issue? Is it a bug? Any fixes? Thanks for any help.