Oops... my bad.
A misconfigured backup job I scheduled made the backup files larger and larger by the day... until the drive ran out of space during the 11pm backup .
All fixed now... took the opportunity to upgrade some stuff, so things should be noticably faster now, especially during peak hours. I've been testing the new changes offline for the last week without any troubles, so I don't expect much on here with the upgrade.
Sorry about the outage guys, someone should've called me to wake me up! hehe.