Problems with Wifi on iphone 4 after updating ot iOS 5.1

After I update to iOS 5.1 is started having problems with my home wifi.
After the update every thing seems to be running alright after after a day my connection was lost.
When I tried to reconnect I got the message "unable to join the network".
I tried the following things:
- Forget network, reconnect: This did not help
- restart iPhone: did not help.
- Reset network settings: did not help.
The next step I tried was to restart my router.
This solved the problem, but after 1 day I have the same issue.
When I go to work there is no problem when I get back home same thing over again.
This is going on ever since I update to iOS 5.1
Before the update I had no problems.
Does anyone have more perment solution.

I have the same issue with my iPhone4 running ios5.1. I have tried everything you mentioned above as well as updating the firmware on my router, setting my router to broadcast on 2.4GHZ or 5GHZ exclusively,  assigning my iPhone a static address as well as a multitude of other mentioned fixes. I have determined this is NOT an issue with my WiFi Network, or Router. All other wireless devices in my home do not have this issue; except for my partner's iPhone4S also running ios5.1. It's WiFi issues are identical to mine. Our other Smartphone, an  HTC running Android, has no WiFi issues whatever.
When I attempt to use WiFi on other networks with my iPhone4, I encounter the same issues: Intermittent connectivity,reporting that it is "Unable to Join Network", showing a strong WiFi signal on screen and yet having no WiFi connectivity, showing WiFi connectivity on screen and strong signal strength, and having no IP Address(etc) under WiFi Networks Settings. After spending a great deal of time online looking for solutions I have determined the following:
This is clearly an Apple Hardware or Software issue. I hope Apple eventually addresses this issue because it is extremely frustrating!

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