Hey guys, I got an answer from the audio team from Microsoft. They said in the latest Windows Insider Build (Fast Ring) they have a potential fix. I updated and so far so good. Sometimes on start up as before it switches to Stereo or 7.1 but I could always go back to Dolby Atmos for Home Theater.
If you still have a problem, test the newest Insider Build. I will report back if the error will come back with this version.