I recently bought a HWMS650 soundbar to run with my Q7 TV.
Initially I had problems with the reliability of the optical link, and after very helpful advice received here I used the ARC HDMI connection instead. That solved the problem.
But after a week of using it this way, I found that the soundbar had set up a WiFi connection to the TV and was using that instead, causing a lipsync problem due to the delay over WiFi.
Now here's the thing. The TV is connected by ethernet, and I have never set up its WiFi. And I have never connected the soundbar to the WiFi either - I haven't even read the instructions on setting it up.
My WiFi network is tied down pretty tightly. It has a long and complex passphrase. WPS and uPNP are disabled. So how did this WiFi connection between the TV and soundbar come about?
I have disabled the WiFi connection now by blocking the soundbar's MAC in the router. But how did it happen in the first place?