Big IP flooding BUG?

Hello experts.

I'm facing a problem in our BIG IP appliance, but I'm really new working with it.

The problem is, CPU usage is 100%, the big ip is creating (I dont know why) connections to inexistent Virtual Servers to port 445. I'm killing the connections, but the appliance still creating new connections.

I was thinking about a DoS, but all IP's are from internal network.

Anyone faced this kind of problem?

THanks all!