I have never found any definitive info and it's a fairly old problem (2011) - see Sandforce Identifies Firmware Bug
I bought an OCZ SSD three years ago and plugged it into my Windows 7 laptop as an experiment. Everything was fine at first and the SSD really put new life into an old 1.2GHz Celeron machine. I decided to try out hibernate mode and the SSD went into a panic mode that rendered it useless (and with no possibility of a firmware upgrade). I replaced the old HDD and by the time I found out what the problem was, the SSD was out of guarantee and OCZ had gone bust.
The lock-up was caused by firmware problems in the Sandforce controllers that are used by a lot of SSD manufacturers, not just OCZ. It is supposed to have been fixed so you may have nothing to worry about. Even so, I shall be very cautious the next time I buy an SSD, and why use hibernate mode when it takes only a few seconds to boot from an SSD?
Happiness in intelligent people is the rarest thing I know.--Ernest Hemingway