A lot of issues

1) I cannot enter settings from game menu or in-game or the game will crash to home.

 

2) Whenever I open my inventory, the game freezes for a while and sometimes crashes to home, freezes fully or snaps out of the freeze and resumes after a bit.

 

3) My world loaded yesterday (11/18/18) with a 1 x 10 chunk-sized hole through bedrock floor to pretty much sky limit (as far as I can tell) as I'm at y71 and the mountain next to me is sheared all the way up past y100). Luckily I made a back-up before this happened (this could also be the cause because it was not there before the copy was made, but showed after). Pictures attached