There is regression in a/v connection handshake js code which manifests itself as some participants randomly not starting to receive feed for some other participants. But other participants receive them fine and not receiving some others. It can even be that user A doesn't receive feed from user B, but user B receiving user A just fine. Reconnecting code doesn't trigger. Half of the time a/v pod refresh button temporarily fix issue with particular user. This issue become a more evident a more number of participants there are in the room.
Introduced in this commit: https://github.com/apache/openmeetings/commit/446b93a1d74826c9e54626ceaf3c75ee013c3301
Reverting this commit entirely or making change below seems to fix the issue at first glance. I'll test this change in production tomorrow.