IPhone 4S No internet on Wifi

I have an iPhone 4S 16bg 5.1.1 from Spint and have had it since day one from launch.
Since that day everything has worked fine until about 4 days ago. My phone is connected to my home and any other public wifi network but cannot access the internet. The connection is made and established but when trying to access the internet from Safari or any other app, it only works for about 20 seconds and then stops working. What is wrong?
I have already:
Turned on and off the phone
Reset Network Settings
Turn on and off Airplane mode
I will not do a hard reset or restore because I have 160 apps full of information and I should have to be restoring anything at all.

Did you also have a look at these articles? AirPort: Reason for 169.254.x.x IP Address and AirPort Base Station (Graphite): Reason for 192.42.249.12 IP Address
My Subnetmask is 255.255.255.0 and the IP starts with 192. When I tap the blue arrow next to my network name in the Settings/Wi-Fi, the settings are DHCP and not BootP or Static.
Did you try this? https://discussions.apple.com/message/15526703#15526703
Message was edited by: Ingo2711

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