If you get disconnected from a tournament, restart the software. Once you've reconnected, go to the lobby screen and choose:
Tools → My Games & Tickets → Registered in tournaments
You can also use the hotkeys 'Ctrl' + 'R' for Windows or 'Cmd' + 'R' for Mac.
Your registered tournaments will display. Pick the tournament you were playing in and press 'Go There' to rejoin.
Finally, other applications and websites can affect your tournament experience. We recommend that you:
If you have issues with your broadband connection, try using your smartphone as a hotspot. Data rates may apply. Check with your mobile data provider for more information.