Me and my friends are already friends in the xbox app and when I create a world, my friend see my world in the joinable server but the problem is when my friend clicks the world it only says connecting to multiplayer... and them it says unable to connect, we tried multiple times and we can't play multiplayer but one time my friend joined and we're so happy but on the next day, my friend can't join the server again. Please fix this problem. This is Minecraft on mobile