Looks like the disruption was caused by maintenance on the servers. It looks like there was a small issue with the maintenance which caused there to be a couple of times where the site was unavailable for several minutes. These problems were unexpected and so we were unable to warn you about them before hand.
There are now plans in place to avoid the problems that happened should we need to do a similar bit of maintenance on the servers again.
Guys, we've noticed some site backups which might have been the cause of the slowness you were experiencing around 2:30am on several days recently. These backups have been adjusted and we didn't see any of you reporting problems last night, which might mean the problems are fixed.
Please do let us know if you experience any further slowness on the site, especially if it's around 2:15am-2:30am.