Hello, could you please share your e-mail?

Often when you try to join someone else the join button reappears instantly, providing no information of why. Sometimes the join and back button becomes half visible, as if the game is loading, forever, making you restart the game. On the other half you can join easily and swiftly with no trouble. The thing is, its always with the same people i can join and the same people I cant so there must be some sort of setting on our devices, right? If you have any suggestions or are experiencing the same thing, fe...