Adding a comment to a dormant Space gives an error

(Bug, Closed -> Fixed, Priority: High, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Conversations
Summary: When I have the Client open to a page, and I let it sit a long time -- long enough for the Space to passivate -- and the first thing I do is add a comment to that open page, it often / always fails with (eventually) an error. Pressing Post Comment again then works.
Not sure of the exact recipe -- might only be adding a comment to an existing Conversation. But I've seen this error a fair number of times now, and I'm pretty sure the recipe involves commenting on a passivated Space.