Steam Community Group Announcement from Avalanche Studios talks about technical problems users are encountering with Just Cause 3, saying they are "fully committed to providing you the best possible experience." To that end a patch is in the works for the just-released action sequel, but they ask for some patience as they work through the process. Here's word:

We know you’re going to want specific information on when a patch will land and what will be fixed – we would love to give you that information, and we will as soon as we have it. But right now, a little over one day since we launched, we have huge numbers of players in our enormous game world and we’re monitoring all the data coming in.

We need a little bit of time to recreate some of these issues and build fixes. Rest assured though – we are fully committed to making Just Cause 3 as awesome as possible. We already know loads of people are having a blast with the game but we’ll do all we can to make sure everyone is laughing and smiling as they play.

If you do encounter any issues, please contact our Customer Support EU [support.eu.square-enix.com] or Customer Support NA [support.na.square-enix.com]

We’d recommend PC players also visit the Steam forums as there are a number of tips there can could improve or fix some of the issues that have been reported (pinned posts).