Volume Bar Problems HTML5

Hi,

Just wondering if anyone else has had an issue with the Volume Bar on Storyline 2 courses published to HTML5.

I'm running a course in Chrome and I can click the volume bar once, but when I do, it puts the volume to 0 and will not let me move the bar again, hence I've lost sound.

I can get the volume back by restarting the module, but that's not a great solution, any ideas?

Thanks in Advance!