There should be a new patch for Arizona Sunshine with patch 1.01 now available.
Here are the version 1.01 patch notes:
A patch required message is now displayed when multiplayer content is started while on an old version of the game.
The (TM) character is now readable
Localization update for German conform naming conventions
The framedrop that occurred when picking up masks has been resolved
When accepting an invite of the same session a player is in, the invitation is ignored
Network errors are now always displayed when a room is closed or left
Zombie targets are now properly updated when a player has left the game
When two players press matchmaking at (approximately) the same time, they now join the same room.
Changed button text from “Host” to “Play with friends” for all languages.
So go ahead and download if it has not automatically installed yet.