Logs me out of game and restarts my whole iPad and freezes it, Long time to load at each loading page!

After logging into the game it boots me out after 30 seconds of playing freezes the tablet and game then restarts and lags a lot and slow at each loading page and freezes at each page until loaded! Other wise I can't play until the bedrock edition hits this next 1.12 update! Or until the new shaders come out in the fall!