I purchased this TV last week, which I'm very happy with apart from an issue I am having with my LG Sound Bar. I have it connected to the TV via HDMI ARC, but for some reason it keep defaulting to Optical. I have manually switched the bar to HDMI but this does not help. I have tried several HDMI cables to no avail and have even resorted to factory resetting the TV, but still no luck. 

On the settings of the TV I have turned the eARC option to off to see if that made a difference, I have also toggled Bravia sync on and off  to see if this would force the ARC connection, but once again this didn't help. 

I have also noted the TV has restarted itself a couple of time while I was in the settings menus and also when I switch the TV off it will power up the Sound Bar randomly. Could this be a software/firmware issue? Is anyone else having similar issues?

Thanks.