When my game freezes, I just leave it alone and it comes back on it's own. I've had to wait up to 40-50 seconds but if I'm patient, it always comes back.
You may not be as lucky but it's worth a shot.
Note when it does this, My CPU and GPUs all go to 0% used. So it looks like a full on crash that didn't fully crash, but it's not.
So give that a shot and let us know if it works for you to.