I'm running 5.0.4.0. Support suggested upgrading to 5.0.4.6 or 5.0.4.9. I don't see that happening in the near furture. I'm at a large healthcare facility so getting downtime is difficult to say the least.
I guess I'll need to stay on 5.0.4.0 until it really becomes an issue. Controller has been stable and has only booted once.