I've been noticing the same thing, only that it happened after 3.1 dropped. It could also be that I'm on the PS4 and there was a Playstation Network maintenance right after 3.1 was released, so it's gotta be one of those or both. My game just completely froze, like everything; screen and music. Fortunately, I can close the application via my Playstation, confirming that it wasn't my Playstation that froze, it's the game. Freezing times happened during loading screens when logging in to just running around (possibly during high populated times because it get's laggy).