On Monday, April 3rd 2017, Evolve's going to be undergoing some network maintenance, starting at 2:00 PM PDT.
This maintenance will affect all platforms of the game (Xbox, PS4, and PC).
What this means for you is that the game's servers will be be down for a few hours. If you're playing on consoles, you'll still be able to play the game in its offline mode. If you're on PC, you'll still be able to play offline in the Legacy version of Evolve.
We anticipate that this maintenance should only take a few hours.