Teleported to Map Spawnpoint

Ok. Devs forgive my lack of detail.. but I am experiencing a very weird bug.

I have players, without dying or going into the End Exit Portal, being Spawned back at the Map's spawn point randomly. It is different players, at random times and I can't seem to nail down a pattern. I know I wish I could provide more details, but it is happening ever since 15w45a