Thanks for your consistent reports! Our Arc team are investigating this issue more thoroughly, and we’ll likely have a solution in a near future release.
I’d like to mention though, in case it may have slipped through the tracks (and only partially relates to Arc, likely not your issue specifically):
We can’t officially support Roon running in a Docker setting. I’m sure your aware of this, but in the future, if you’re looking for help from our support team, you’ll need to set up a temporary instance of Roon that falls within the scope of support.
Thanks for your understanding 