Really weak connection on xbox360

My xbox just takes it upon itself to start acting like a little baby not getting its way and starts kicking me out of parties and giving me two yellow bar connection on cod5 so that its not bad enough for me to stop playing but bad enough for me to keep complaining about it and have my *** handed to me while I shoot someone that's not even looking at me and yet they can turn around and shoot me between the eyes . I have a wireless internet modem in the room across from me and in the mornings I can host matches because my connection is so good. At first I thought it was congestion from all my neighbours internets but it kicks me offline at 3am when no one else would be on. can anyone help me before I throw it out the window and break it like my first xbox (which actually got 1 ring of death after 3 years).