IPhone Wi-Fi Connection Problems? - 2

While I'm on campus at my university, the 3G is basically non-existent. I connect to my school's wireless and it always connects fine and works great but as soon as my phone goes to lock screen it disconnects. Every single time. Why does it do this and is there anything I can do for it to just hold the connection? This doesn't happen on my own Wi-Fi at home when my phone is connected.

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