[Manny]

Ok, start off by answering a few questions:

Did you change from '56k' to 'Cable' in the Multiplayer Options?

Also, what kind of lag is this? Is there a connection problem symbol near the buttom of the screen? Does it say 999 ping or something like that when you press tab? If not, it's your pc, not the connection.

Refresh your internet servers. Then, click on the 'ping' button (this will put the servers with the best ping times on top). How do the pings look like there (are they between 50-100?)?

When you play a game, do you have lag once every hour (rarely) or every few minutes (a lot)?

When you -download- something from a stable server, after about 60 seconds, do the download speeds still go up and down?

If they do there must be something wrong with your connection. It should be stable. You should contact your ISP (Internet Service Provider) and tell them about it. If they don't do anything about it keep bugging them. Otherwise, change the provider (if there are others in the area).

Also, you should download a few tweaks from dslreports.com.