We had a table in our database that kept error logs and it was going way beyond our server limits. Wiping it clean (and fixing the cause of said error logs in the php code) fixed it.
I may be wrong, but if I remember correctly, this is exactly what caused the humongously long outages when Galleon was running the show. He'd get busy with his real work, forget to check the server, and the log would overflow with errors. In that case, it went on for weeks. To the point where I often wondered whether the project had reached end of life. Very disconcerting. At least here, the outages were always short. Thanks, Fellippe!!