Samsung Q990D connected to LG C1 display via eARC. Problem has presented itself with both Apple TV and Sky Stream box (and indeed internal apps on the C1).

Have tried 3 different cables on the eARC.

1/5 - 1/10 times the soundbar will power on with the TV as normal, be volume adjustable on the display via the TV, however will have no sound. This continues if I try and cast to the soundbar, play via bluetooth etc, so presumably is not a format issue from the TV.  

To resolve the issue, I need to power off and power on the bar using the remote, at which point it works.

Have tried a reset to defaults. Is anyone else having this issue and is there a resolution? On FW 1016.