I get up this past Monday morning and the wifey says no internet. Sure enough wireless and even my ethernet connected iMac don't have a connection. There's a message on my iMac saying "another device is using" my iMac's ip address. Well, we've not installed any new devices or software for quite a while. Reboot of the ATT router and my iMac don't fix it. I call Apple and we putz around for awhile and Apple says it's the router. I call ATT and on the phone for an hour and no joy. So a tech comes out the next day. This is uVerse btw. He says they've got a new way of hooking up the stuff so I get a new box on the outside, some rewiring, and a new router. After a while, he gets it working, and then I want to customize the network name and password. We do that and the old problem starts again. There's another device again. This also happened the day before when I was on the phone with ATT. Much more putzing about and the router is reset to factory defaults but still not working right. He replaces the ethernet cable to the iMac and calls the office and has them reset my account. Now it's working and I'm getting speed faster than I've ever gotten. He does a speed test and it says I'm getting over 50mbps. I did one later it says 20mbps, still more than I've gotten before. I should point out that the week before, I had called and cancelled my uverse land-line and got them to upgrade me to 18mbps, but at the time it really didn't seem to be much faster. Now it is. I think what fixed the connection was the reset of my account. The increase in speed might be coming from the new router and rewiring. I don't think the rewiring and new router fixed the problem, though I am happy to have them. What I think is weird is that message about another device. We had no new devices or software that I know off. Since it was keeping my ethernet wired iMac from hooking up, why did it also disable wifi? BTW, during all this, the router lights indicated all was well. Strange.