If you read the TFwiki article I linked to in the update post on the front page, it seems like this kind of plastic failure is not preceded by any markings or other warning. It just dies one day.

For what it's worth, my Transmetal Megatron is still in one piece, though detail painted to where it's not suitable for review photography. On the other hand, I don't handle it anymore since I'd like it to stay together. Thankfully thus far the only common ailment I've experienced with any of this age of toy is chrome wear/loss. (poor bald Scourge)