Only my Desktop, the first device I set up to use my 6620L can find the wi-fi signal. A second desktop, two laptops and an Epson wireless printer cannot find the wi-fi signal. All worked for the first two days and all worked on my old Jetpack 4620L. I haven't made any changes to any of the devices. Have powered all of them down and re-entered the setup info to no avail. Any ideas?