I experienced this issue today, currently working from git version 4644 (so it’s a few days old). I’ve had about five computers disappear from the web interface throughout the day, but they remain in the database.
Also, and I’m not sure it’s related, but the service settings on some of my hosts are being changed regularly. I have one computer in particular that will regularly have all of it’s services turned off for some reason. I then turn them back on, and it’s good for a few hours before the settings get wiped again.
I’m leaving work for the day and have the next two days off, but when I get back I’ll make a separate thread for the services issue if it’s still a problem.