Airport Extreme problem with router
My husband and I have been having big problem with our Airport Extreme. We've had it for several years and it's worked fine. We have a Lenovo laptop, 2 iPads and 2 iPhones, plus 2 TV's that connect to the Internet for Netflix. All was working fine. At one point we added an Airport Express to extend our network. That worked fine as well. About a month ago we began losing our Internet connection periodically. Our cable provider came and boosted our incoming signal. They also replaced our modem. We now have a Motorola Surfboard model SB6141. We have done repeated hard resets on the Airport Extreme. We also took it to the Apple store and tested it. It appeared to work fine. This morning I disconnected the Airport Express and gave the Extreme another hard reset. I set up the wireless system using different names and passwords than we used previously. The Express is still disconnected. I can get a good wireless connection on my laptop for about 30 minutes and then I lose it. I can restore my Internet connecction by unplugging the ethernet cable from the router amnd plugging it back in. I have done this several times and the connection has come back. The ethernet cable is not the problem as I have changed it out with no effect. The moden seems to be fine. I have rebooted it a few times as well. The cable company tested the signal coming in and it was strong. I can connect to the Internet using the modem. The problem seems to be between the Extreme and the modem. I set up the Extreme using the automatic settings (I did not set it up manually). Does anyone have any ideas as to what may be wrong?
iPhone 4S, Windows XP