I updated the bh5140s home theater by downloading the current firmware into a usb flash drive ... instructions and firmware found here:
http://www.lg.com/us/support-product/lg-BH5140S
So far no further issues.
The solution I've found is to turn off the tv sound and simplynk options on the home theater box.... the competing settings between the television and the home theater system are causing the disruption. .. so let the tv control it all.