This just happened to me too.
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David Brixey is your man for this issue. It used to happen to me a lot and David and his team spent weeks hunting it down in the logs.
I haven't seen it so much recently though.
Not reading all the links here (no time), but whatever you do - don't move a case 'discussion' from Support or your secret group into a group that doesn't support cases (which are a special form of discussion and have an Environment field). Would be nice if JC stopped you doing that but I dont think it does.
I'm happy to report that the bug is gone. I can now again add new replies to
any discussion/questions I've started.
P.S. Not sure since when it's workings fine again. But I want to stress that no content of mine
moved around, not before it stopped accepting replies and not when it started again to accept replies.