I have an xbox running to my fios router through an ethernet cable. Then, I have another xbox that belongs to my friend running the same way. I then have 2 laptops and a desktop. Laptops are run wirelessly and the desktop is run via ethernet. All computers have an excellent signal and both xbox's have very unstable signals. Signal will be strong for a few minutes, then it will get so weak that it will not stay connected to xbox LIVE at all. Any ideas?