Xbox only connects to internet/live from very close

My Xbox will only connect to the internet/live through wifi from a few feet away. When I take it to a second floor of the house (small flight of stairs about 25 feet from router), the signal strength still shows full bars and will connect to network/router
but the xbox possess internet connection errors. Most of the time I run the network tests it will not connect to the internet, but every so often it will establish internet but then fail to connect to live. Is my internal wireless adapter weak/broken? All
other devices (phones, computers) pick up internet flawlessly from same area, full signal strength.

Just really confused with this one. I have reset my router, reset configuration settings on xbox to factory. nothing has worked yet..

please help!

:)

 

My Xbox 360 keeps freezing and closes itselfs

My Xbox 360(Normal)Keeps freezing and closes itself.And I cannot connect to Xbox Live .If I connect it only connects for 30 minutes then I can't connect to Xbox Live a whole day.

 

Connection Problem With New Internet

I just got new internet from Frontier. It is 12 meg and I am having a problem on xbox. When I connect, it only connects to the Network. I can sometimes connect to the internet but never xbox live. What is wrong with my connection and/or is xbox compatible
with 12 meg from Frontier???