A recent message from the website host:
System Administration is currently migrating or will be migrating your account … to a newer server to better meet your needs. You should have no downtime during this move, and will be notified with your new server information once it completes. Please postpone changes until the move has been completed and DNS propagation completes.
This may be why my recent posts disappear and reappear and disappear again, and why Steven’s recent comment vanished overnight. You might find it annoying. I find it infuriating.