Recently I've noticed several active discussion threads get shut down because one of the moderators noticed that there was a 46 day gap in the discussion half a page back. I would like to know why this is. The explanation we had always been given was that if there was a gap that long then there must not have been anything left to say. However several of these had several posts after the offending post, and in at least one case I observed the offending post was from over two months ago and the conversation had continued from that time up until the thread was abruptly closed.

What is the point of this?