Win 2K servers KAput

Hi,

I have the following issues with three webservers I have have. They run Win2k Advanced Server and just seem to be acting really funny.

1. Have three servers colocated
2. All now have direct access to ISP hub
3. Basically the machines are denying access 50% of the time and seem to be shutting and opening up ports by themselves, or so it seems, ie I do a port sniff Port 80 on 210 is closed a minute later says open. Same with 214 whcih servers mail - I can get mail 25% of time when I try to connect.
4. Speed varies - sometimes it is really fast then slow then no connection.
5. Thought it may be Windows update but not all of them have the same updates. I removed these on one but no effect.
6. Licensing - could this cause these issues, I am unsure what my clients have got in terms of this?
7. Nothing in the logs says anything about what is going on.

This is very perplexing - they did do a microsoft update before this happened I took these of but didnt seem to fix the problem.

Regards

E