As you probably know Aggregate has reached end-of-life is no longer being updated or supported.
That said, your best bet is to figure out if there is a common pattern in the corruption (e.g., are they all from the same make/model of device) and go from there. If you write to the database or have modified Aggregate in some way, that's also a potential place to start exploring.
Also, presumably this system has been running for a long time. Think through what has changed recently that correlate to this corruption and that might also offer clues.