The game runs fine when I'm playing. But when the autosave comes up, my game starts to lag. I can move around and place blocks. But I can't open chests, spawn mobs, use pressure plates, take damage and so on. When I break a block during autosaving, it won't drop until after the saving is done. Also the time keeps moving during saving, but when it's done autosaving, it jumps right back to the time before the autosave. 

I tried reinstalling the game and using an older version. But none of it helps.

Im using the Java version, and latest update.