My understanding is that DoS is to blame for Stevie's misbehavior. Not much we can do about that unfortunately. Stevie itself isn't overloaded (firewall just drops the packets), but HE's network leading to him gets clogged by it, so nothing can go in or out. Notice how Stevie's load is normal the moment he comes back online in those graphs? If he was overloaded, you'd see gradually improving load as he recovers.