My network extender worked great for years but now all the lights are blue but my iPhone 6 will not connect. I did the standard reboot of the modem/router/extender to no avail.  I swapped out the cable between the router and the extender and it worked for a very brief time (minutes).  I changed out the router as well.  No help.  I used the old cable on other devices and it works fine. Since it worked when I swapped out the cable, I'm guessing the fault lies in the connection to the device.  Since I've been using it for a few years, I thought i'd get a new one but Verizon does not have any, either the 3G or 4G, in stock.  Any ideas, folks?