Connection Problem?

Ok so ive been playing Xbox in my brothers room, while i waited for my new TV to come, and the connect from the router to the Xbox has been perfect.

Yesterday my new TV came so i moved the Xbox back to my room, Since this has happen whenever i connect to xboxlive it makes my connection go, and doesnt go back on untill ive removed the cable that links the xbox to the router.

Anyone else had this problem? ive tryed so much to sort it and nothing seems to be working :(

+REP to anyone who can help me.

Moved by Oleh (Forum Moderator): As I feel it is more suited here.