Pilot ejected.
Bravo variant...as was the one that infamously went down last September after flying for many miles after the pilot ejected (Anyone seen our fighter jet?), as was the one that was in hover mode and bounced with the pilot ejecting in 12/22.
This one had reportedly just done a STOVL takeoff at the request of guys on the ramp.
To my knowledge, there has been no official cause released for the last two mishaps- including whether the ejections were initiated by the pilot- or the auto-eject feature of the "B" variant.
Correlation is not causation, but sure makes me suspect- especially given that one of these aircraft continued to fly for many miles with no pilot. Sure would suck for the aircraft to punch you out when you have no clue it's coming...