I have a Frontier Communications router with their 15 Mbps download/5 Mbps upload plan. I have a 5th-generation Airport Extreme connected to it via Ethernet cable, configured as a bridge router. At the other end of the house, I have a 2nd-generation Airport Express configured to wirelessly extend the network. This setup had been working fine for several years. However, three times during the past year, I've had to do a full reset of the Airport Express after it went into solid-amber-light mode. The first time, I had to do a firmware upgrade. The other two times, I unplugged the AE, held down the reset button, plugged the AE back in, waited 30 seconds, and reconfigured the AE using Airport Utility. Each time, though, I had to do the reset several times, because the routine failed due to an "unexpected error." This last time, though, the Airport Express isn't doing its job. Airport Utility sees it as extending the network, and the green light is on solid. If I unplug it and then plug it back in, the amber light come on solid an then flashes, and then the green light comes back on solid, as it should. If I use my iPad speed-test app near the Airport Extreme, it shows 15/5, as it should. If I use it near my Airport Express, the download/upload speed is about 3/5. If I unplug the Airport Express, the download/upload speed also is 3/5. In other words, the Airport Express doesn't appear to be amplifying the signal at all, but there are no errors associated with it. I can't say for sure that I used to get 15/5 near the Airport Express, but, subjectively, my Internet speed was just as fast there as it was at the other end of the house where the Airport Extreme is. I did a Web search and couldn't find anyone with this particular problem. I have two Macs, both with the latest version of Yosemite. I have an iPad and an iPhone, both with the latest version of iOS 8. Is there anything else I should try, or is my Airport Express likely defective?