A lot of potential issues come to mind, but not being a technician, means nothing. 1. Is your wifi an older model? Could it be on its last legs? 2. Have you tried checking with a friend, preferably someone who had done the iOS6 upgrade, and check to see if you can use their wifi router? 3. You might Google the problem, or go to the Apple discussion website. We will be glad to give you any advice we can, but sometimes it just pays to try and pinpoint more information of what is happening. I have spent hours trying to figure out a problem with a device, only to find out that my phone service had gone down. It may be that simple, or you may have discovered a new bug that no one knew about. The solution is out there.