Just called VM and they say my power levels are wrong. I am not convinced. My Downloads on my PC are superb. they say they can send an engineer around. I actually think my speeds and ping are good and am very cautious about letting them tinker with it when I am 99% sure that power levels are not the cause of the Xbox live problems. They say that my downstream is too loud and my upstream is too low. The speed I am getting looks good to me (Doncaster is not scheduled to have the upstream upgraded for another month so not sure what is happening there).
Could the power levels be the issue? I sincerely doubt it.