I've been getting this too. I was at the NW airfield where I decided to log out for the night, and when I logged back in I was at a random spawn point along the coast. From my experience it happens when you switch servers as I was on Virginia 13 and switched to a Russian server to find that I was at the coast near Elektro, fearing what might happen there I went back to Virgina 13 where I found myself where I logged out before I went to the Russian server.