[UPDATE: We've fixed the issue!]
[UPDATE: We've found the main cause of the issue, we'll be fixing it tonight when the traffic is the lowest. I appreciate your patience. Thank you!]
[UPDATE: The issue seems not fixed yet. We're working hard to fix it. In the mean time I've stopped ads from displaying on blogs as an apology...]
As some of you might be aware of we upgraded our servers today, which somehow resulted in the database corruption that was causing the site to stop functioning every now and then.
I'd been working with our hosts to diagnose the problem (the hosting guys told me an hour ago that one of the tables had corrupted - very good work by them ) I'm positive that the errors should stop now that we have fixed the issue.
Thank you very much for your understanding and I deeply apologize for the inconvenience all our users had to face.