ITouch loses router and DNS addresses?

I have had my iTouch for about a week and it connected to my wireless network for the first three days flawlessly. Since that time, it will only connect sporadically and I have noticed that when it doesn't connect, it is because the router and DNS addresses have disappeared in the wireless window in Settings. I can get them back occasionally by renewing lease in this window, but more often than not, renewing lease does not reestablish these addresses.
I reset the iTouch through itunes, but this did not solve the problem.
Additional information. The iTouch has the full signal (maximum number of bars). I am using an airport extreme as my base station. I have three macs that I connect to the wireless network through the base station. I have a few airport expresses that are connected to audio equipment or video game units. All of these continue to work well and have no problem connecting to the wireless network.
Your help/thoughts would be most appreciated.
Message was edited by: tritium11

Is your router broadcasting its SSID? If not, try enabling that because the Touch often has a hard time remembering a network if it is hidden. Hiding your SSID is very minimal security, so there's really no point to hiding it.

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