LG Sound Bar Volume Issue.

[Naylsey]

Hi, I've recently purchased an LG sound bar which. I've connected to my TV with an optical in/out cable. It worked fine for a period of time but now the volume races up and back down with no one touching the control. Is it knackered or just a dodgy connection do you think?

 

[popatim]

could it be sunlight hitting the ir receiver on it?