he might be more computer literate than me and explain better, but from my limited knowledge first errors were due to connection to the database, and it seems its now stable while its locked to 2day ago information, so either something past 2 days keep getting corrupted, or somebody found a way to inject malicious code thats keep crashing the database so they locked it at current state till they figure out how to patch it.
since vBulletin platform (used for both oh2 and this forum) is a commercial product, they might be working with the other dev team to solve it, or it might be just an exploit of older version. its been a while i played with vBulletin but before you could either buy either standalone version or subscription version. so if its standalone might be a little outdated with some security issues.
anyway thats too long of a post already
edit: it seems latest version is 5.7.5 and oh2 running 4.2.5 so might be somebody found a way to fuck with it not in a pleasant way.