Since some hours, one of my minecraft world doesn't do anything anymore for some minutes, then it works properly for some seconds. These are the symptoms:
-animals/villager etc. dont move
-frame rate drops
-game doesn't save
-mined blocks dont drop entity-blocks and appear back after some seconds
-sometime you get teleportet to a location you were seconds ago (happens together with block re-placing)
It kinda feels like the game stops for some seconds (you can walk around and place blocks) and then renders everything in 1 second (like damage or mob spwaning/block placing)
I had this issue in the same world before in, i think 1.4 or so. I edited the level.dat and set time to 0, aswell as daytime, lastplayed etc. (everything with time). But this time this doesn't work.
It only affects one world.
EDIT1: I forgot; i also tried to get it running properly with a completly new level.dat. (is edited seed etc.). Before the bug appeared, i oppened the world in the snapshot 13w16a.