Talk:Known Bugs And Glitches/@comment-29689597-20160822182655/@comment-30794628-20170206150005

This is because of poor connection. I had this too, it gave me the "Rock Bottom" achievement. If you have bad connection, the game can't load blocks from the other players world, so you will fall to the bottom, until you lose connection, or it fixes itself, which will cause you to suffacate in a wall if blocks happen to load on top of you.