I had a weird experience today. I turned on the Wifi on my 2nd Gen iPod Touch and connected to a network that I've been connected to before. After a little time, I noticed the Wifi symbol was no longer appearing in the upper left area of the info bar and, of course, I couldn't connect to the Internet. I launched Settings to check to make sure I was still connected to the network and saw that I was. It had the network name listed there and a check mark next to the network and the signal was pretty strong but no Wifi symbol. I finally turned it off and when I got home, everything returned to normal. Does anyone know why this happened?