Speratic Xbox Live Connection?

Q: I am in an apartment complex with a wireless internet connection for the complex. I own a PS3, a Wii, a 360, a HP Pavilion laptop, a Sony Vaio laptop, and an HP pocket PC... EVERY SINGLE INTERNET USING SYSTEM/COMPUTER Has a full 100% connection; EXCEPT my stupid Xbox 360, while I am playing COD4 on Live my connection goes from 1 bar(red) to 2 bar(yellow) then will jump to 4(perfect) back to 1 then to 3. and so on and so on! BUT EVERYTHING ELSE IS PERFECT! What is wrong with this, and how do I fix it?

A: Is the xbox near something that would hinder the signal? EG.Microwaves?,speakers...ETC. I noticed that my wireless headphone transmitter was effecting my internet on my pc because it was right next to the antenna.weird.

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