L expiry rules changed
We've recently added to the channel expiry feature on the L service to remove the bot from little-used channels. L will now part from a channel if its user count is consistently below four users for a while, as well as the existing expiry check, where no one with a chanlev on a channel enters for 20 days. The four user limit includes both authed and non-authed users.
If your L is deleted for this reason, you will need to rerequest it, and make sure that the channel is sufficiently well used to keep L in future.