Hey so, 
I was going on an adventure in my singleplayer world, when randonly my game froze for 3 seconds, then i came back to a screen saying "Ancientsapling hit the ground too hard"
I was on a flat-ish area, with the highest area being about 10 blocks.
I dont know if it was the character being stuck in the ground , due to lag and then dying, which i doubt because it wasn't a 1 minute lag.
I would really like this to be checked out, and hopefully fixed, thanks.