This problem has come up in the past week, or so, on my iPad "4." It had been working fine in my apartment for some time, no settings changed or anything, and all of a sudden stopped. From what I was able to gather from perusing this thread, iOS 6 can run into issues connecting to personal wireless routers after bouncing around between other networks. I'm guessing my problem stems from my going out of town over the holidays, and now the iPad won't reconnect to my at home router.
Anyway, I've basically tried everything on here (I think) to no avail. I've tried the WPA, WPA2, new firmware, network reset, soft reboot, Wifi on-off, modem on-off, router on-off, new DNS numbers, manually entering the network information after a complete reset, a total restore from iTunes.
I have a Netgear WRN2000v3 router, and it's working perfectly fine between my iPhone 4S, a Samsung Galaxy 3, and two laptops. When I check the connectivity of the devices, from about 10 feet away my iPhone is getting a signal strength of 98%, and the iPad gets between 30% and 40%. 15 feet away feels like I have my old Blackberry operating on Edge, and 20 feet or more it's totally functionless. The same devices I mentioned work perfectly well through my home, so it's not an architectural issue.
In any event, I'm out of ideas and I think I've tried the ones listed in this forum. Is anyone still having these issues, and any ideas to resolve? Without diving down the slipper slope of fault, wasn't a selling point of the newest iPad increased WiFi performance? I have spent about 10 hours over the past couple days trying to figure this out, and am growing increasingly weary...