[Zulithe]

What kind of error do you get when it disconnects you? What server (or does it seem to happen on all servers?), and do you find this happening with other games? Try some other games online (like maybe diablo II, Half-Life or something) and see if it gives you connectivity problems also

And keep an eye on your cable modem's lights! If they start blinking unusually or going dim, there might be problems with your provider (not a problem on your end) if this happens, make sure you call them and they can give you a credit towards your bill.