I was using Pandora a few hours ago, and had no problem using wifi. I turned the ipod off, and went back to it again a few hours later. Suddenly, I am unable to join the same network I was just on a few hours ago. There is a crappy free one that I never use that I can connect to just fine, as a test. My computer connects to the network on which my ipod can't work just fine. It used to connect, and now it doesn't. I can't envision any factor that has changed other than time, and my PC still works online as it should. I've tried resetting the ipod's connection settings, and resetting the ipod multiple times, to no avail. Any idea what is going on?