My game is not letting me sign in

i was just trying to play my gae but then i joined my friend and he was in a big server and it was realy laggy and my game was so bad and laggy it crashed and i had to reload it and it tried to sign back it but it would not let me back in and it said could not connect to server, please try again later and i did what it said i reloaded it and waited abut 5 min and i tried it again and every time i try it will not let me in the game and im a bit sad beacause all i want to do is sign in and play with my friends but it wont let me sign in and play with my friends