adding:

~ random death, second floor NE airfield control tower. Standing at top of stairwell on the second floor, died instantly while arranging gear.

~ Went back to find body about 10 meters outside the window from the second floor, all items destroyed, nothing missing, as if he had fallen.

we have had things fall through floors/stairs very often. this does sound very much similar to that issue your describing.

I would suggest looking into the stair ways in the ship, NE map. Some of the stair wells you can go down but cannot go up unless you crouch.