Good afternoon Ben17,
Sorry to inform you but this happens to everyone, usually it has to do with technical failures of your internet service, because when the connection fails, FlyOrDie automatically tries to recover the connection, within some time if it is possible it recovers and allows the continuation of the game, if not... as you very well said: Game Over, but about this there is no turning back, there is no need to be discouraged, but to continue playing and not give value to that.

Good luck and have fun✌
Best regards
Dav7d