UPnP and Xbox 360

I purchased my xbox 360 about 4months ago, and ever since then my xbox LIVE connection keeps cutting out on me during games, movies on netflix, and miscellaneous other things. I keep getting the error that says i need to enable the UPnP on my modem and/or router. I own an airport extreme and I am fully aware it does not support UPnP. Is there any way I can somehow "enable" it, or is there a program that will serve the same purpose? I really just want to use my xboxLIVE not much more..... Thanks