XboxLive lag issue

[doc octopus]

I would like to point out that the router gives me problems in online matchmaking, lag issues. Problems that I have not found with the beta version .188, where the response to commands is faster and also to the actions of their opponents. With previous versions (.178 and .162) and the next (.220), online gaming is not very usable because of the lag.
This beta version but has problems on the radio where the signal is weak and inconstant.
What can be caused by this behavioral difference?