Everytime I try to do anything in Minecraft it will just kick me out..

Everytime I get on Minecraft it boots me out completely, I'll go into my world or a friend's and it boots me off the app, I try to enchant my stuff and it kicks my out of the app, I just started doing this after the newest update! I don't know whats going on but I would like to be able to play Minecraft with out getting kicked out of the app!