Dissapearing items

Hi,
Sometimes, when I go in a world while logged in on XBOX, all the items in my inventory dissapear, and I spawn at the world spawnpoint. However, when I go out of the game and rejoin, all my stuff are back, and I'm back where I originally was. This issue is really annoying, and it can scare some people. Hope you will find a way to fix this.
-Carmen