Autosaving messes up the game in both Single player and Multiplayer

Ok, so me and my friends are enjoying our world, but whenever the autosave icon shows up, blocks don't work like they do. Breaking a block whilst still being there for some seconds, you can phase through the block, seeing through the world for a short time. Blocks take some time to be placed or placing is late. Sometimes the game freezes and then comes back on, other times it just freezes and doesn't come back on. And torches sometimes don’t light up. Thank you - YeeYee Pit