Hi, 

Both my sons, 7 an 10 year old updated minecraft on their iPADs. After that they are just kicked out when they try to launch the game. Can see Mojang logo and minecraft logo and then it closes. Sometimes they can play for 1-2 minutes. 

Tried to reinstall on one iPAD and then the 7 year old lost all his worlds as they are obviously just stored locally!!! 

I have found several people reporting the same issue after this opdate, for example in the comments on this site :

https://www.product-reviews.net/down/minecraft-pe-app-problems/

Unfortunately no info from Mojang  

/JohnBull