IPhone drops wireless network connection

My iPhone can't keep a wireless connection. I can establish the connection as indicated by the wireless network icon, but within less than a minute it reverts to the 3G network icon.
I've tried numerous times to establish a persistent connection, to no avail. During one of those attempts I received an error message "could not scan for wireless networks." I haven't seen anyone else here get that message.
Any ideas what is going on?

I suggest resetting the network settings on your iPhone.
Go to Settings > Reset, and select Reset Network Settings.
This will erase all existing wi-fi network settings stored on your iPhone. This will require re-entering the password for a password protected wi-fi network and reconnecting to all wi-fi networks that you have access to.
If this doesn't work, try a reset, which is done by pressing and holding the Home button and the sleep/wake or on/off button simultaneously until you see the Apple logo and then release - ignoring the slide to turn off prompt when doing so. An iPhone reset does not affect any data or settings.
If no change after a reset, try restoring your iPhone with iTunes from your iPhone's backup - which is the default selection when doing a restore. If there is a problem with your iPhone's backup, restoring your iPhone from your iPhone's backup will restore the problem. The next step is a restore as a new iPhone or not from your iPhone's backup.
If no change after these steps and if you are in the U.S., time to give AppleCare a call at (800) 694-7466, or make an appointment at an Apple store if there is one nearby.

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