It's interesting that this happens just as the server is moved to a new machine. That leads one to believe it's either related to the migration itself, or that the new machine might have faulty hardware somewhere (perhaps a memory module or a disk drive?).
But I guess it could just be a fluke as well.
EVE Online characters:
Daedalus II ex-CEO TOGOA, Daedalus III slave of Daedalus II
Little Molok Asura Engineer
"Trying is the first step towards failiure" - Homer Simpson