Cannot select Optical + TV output if eARC is plugged in

[starwoodtech]

I have an optical plugged into a hearing aid box. I also have an LG S95QR sound bar plugged into the eARC.

Works fine in eARC. When I try to select the optical + TV option for output, it switches over ok for about .5 seconds, then automatically switches back to the eARC output without me doing it.

Does anyone know what it might do this? Why can't I change my output if I so choose?

[td47]

This may well be the TV firmware working as designed. You might want to try turning off the SIMPLINK (cec control) in the HDMI settings. However, if you have the Soundbar coming on when the TV turns on, you might lose that facility, and have to turn it on seperately.

[Markus Kern]

i have the same soundbar and the same problem, when i switch my soundbar to optical output it immediately goes back to eArc.

The solution:
I have now connected my soundbar via WIFI and it works.
This is one of the many problems with this soundbar that LG is not willing to solve.

[starwoodtech]

So I spoke with an LG tech as he visited my house last week. This is in fact the design for eARC only. It has an ovveride. The idiotic thing about this is that NOTHING is mentioned in any documentation anywhere, and phone support has no knoweldge either. 

When I power off the sound bar, it will switch to the optical and play normally. This is not a deal breaker, just an an annoyance. But the latter are starting to pile up.