Not Being Able to move and Game Crashing

Being Unable to Move and Game Crashing

when I entered my world I expected to be able to Move. Once I did get moving I expected the game to keep working.

What really happened was that once the world loaded I could not move until I went into creative mode and flew up and landed. then after only a minute or two the game crashed. When I got back on the world it was like I had not moved at all after I got on the last time. this has not stopped happening.

Steps to Reproduce:
1. get on world
2. see that you cannot move
3. go into creative mode
4. fly up and then land
5. go into survival mode
6. go about as normal until world crashes
7. reenter world and see that you are back where you were when you got on the last time

can now move and do not go back to starting point, but game still crashes

P.S the starting point for me is in water. this may have something to do with it all.