Devialet's answer on the stereo sync issue

[MusicEnthusiast]

I haven’t received an email so far, but I used the update button in the app after reading your post. The app immediately started to download the patch. I had to do the update for each phantom. 
The firmware number changed on both. Unfortunately I had no time to test the phantoms after the update, but I will do tomorrow and report if the problem is solved in my case. I keep me fingers crossed for you and all the others that this update will bring back the joy of listening to phantoms.

What is the firmware version after the update? I tried the same, but no updates available..

My firmware number now is 2.8.5

So far two hours of excellent music quality without any sync problems. It seems that in my case the problem is solved. Keep you updated....