My controller keeps blinking on and off when in game. It's stable in menus but once I leave the menu, it starts cutting in and out. Controller is up-to-date with firmware and no issues in any other game.

My friend who also plays is having the same problem.

Hey Engelschrei! I'm sorry to hear that you and your friend have been dealing with controller disconnects while playing Grounded. Can you please submit a support ticket so that we can log in and investigate this issue and provide you one on one support? This forum is for players to assist each other with known issues, and you might not hear back from anyone depending on the issue. If you decide to submit a ticket, can you please include the following information?

1. Platform (Xbox Console, PC Game Pass, PC Steam). 
2. Multiplayer or Single Player Game (if multiplayer, can you let us know how many players in total in the game and their platforms if you know this) 
3. Description of issue. 
4. Last thing you did in the game before the issue occurred, if applicable.