Sign-in issue- game crashes once signed in.

Hello, I have only recently noticed this, yet it properly began 3 days ago. The issue is that, when i load up minecraft, i can go and press sign in. i press said button, and sign in. either button i press i (leave on device, or that other button) A] I don't get get the sign in thing unless i reset my ipad, and phone, and then sign in , still crashes, B] I don't get to sign in, and it auto signs in (yes i deleted  it s few times,). Basically, once i sign in (in any way) it crashes either immediatly, when i load the game, or when i press any button or wait a few seconds even when i am in any menu. Please Please help. I have tried using two of my accounts, yet it won't work. I don't have xbox live, so i use my ipad. I really want to make a realm as well, and need to sign in for that stuff. That is why it effects  me. That's alll  i can think of in the issue currently. it ONBly started getting bad , like, really bad today when we had a guest over. they haave left since then, and it still won't work not sure what t do or if it can be fixed. please try to do anything that can be done or treid if possible. thank you for reading this post.