As soon as you lose your data connection to our servers, the screen will turn red and an error message is displayed. During this time a computer takes over your seat and keeps playing as best as it can.
Once you regain internet connectivity, you will automatically join the game again. As a computer was playing for you in the meantime, you might have different hand cards after you reconnected to the game.
This behaviour makes sure that players don't lose a game or get kicked out of a game, if the internet connection is briefly interrupted or a phonecall is answerd.