first of all, I was healthy. I was running in 1st person and suddenly the game went to 3rd person and my body ragdolled to the floor and then it faded to black..
ps if this helps, i was below Vavilovo in the construction site

this has happened twice in two days and both times it was when I was inside a building (last time I was in a Police Station) and there is no way i could have been sniped in either of those situations