My Char hangs playing in my Realm

I'm having a problem playing MineCraft PE.

I created a Realm and I'm playing with a friend, it comes to a certain time that I lock in the game, my friend sees me standing still while I'm walking, so I have to leave and enter again, but soon after minutes happens the same problem . I really wanted to know how to solve this, I can log in to Realm normally, but after a certain time my friend has caught me in the game, but on my screen I keep playing and watching him play, so I have to go out and go back to normal, but it always happens. Please help me