Yes, I experienced a family member having it. It was more scary to me worried about them, than it was for them, I think. Though they were confused about what they were doing, and why they were in the specific location, etc...
They were tested and checked, as I took them to an ER, and nothing bad was found, and it never did recur.
They never did remember those few days they totally forgot, though. Nothing at all, in their memory, that they had done, prior to the episode, for that entire time period. All wiped clean. Shocking it was for me, who remembered important, significant happenings those days, that went missing for them.