On the MyFordMobile.com site and here I have seen about 4-5 mentions of Stop Safely Now issues. In at least two cases, Ford has flown 2 engineers from Dearborn to review the issue. In the most recent solved case, a connector pin was not fully inserted into the connector housing. Exact quote: "It turned out to be a loose connection, they found a 'problem with contactor circuits at lower battery 40 pin connector. Pin #25 was not locked into connector completely..'"
I see your crosspost over on MFM, so you probably have already read this information.