Cannot login to Minecraft with Xbox account and when it does page freezes

For the past 36 hours I am no longer able to play Minecraft. When It logins to my Xbox account on opening screen page freezes and I cannot do anything. Even when I don't login and try to play Minecraft it states I must login into Xbox account. It then starts to login in and once again freezes does this on all 4 of my iOS devices so I can no longer play Minecraft at all. Why? And when will this be fixed?