Do a little fact checking before you follow my advice, but I seem to remember having this issue with my iPod Touch after an OS upgrade, and the fix was this:
Go into your Settings ap
Go to General
Go to Reset
Select Reset Network Settings
Be careful because there are lot of buttons on the Reset menu that you don't want to push. And if you reset network settings, I think it may forget every network you've taught to link up to. If that's just your home network, then it's not a big deal, but if the iPad gets around, that could be a pain. But then I don't actually remember having to retrain it when I hit that button, so maybe it's not as dire as all that, but you should research exactly what that button does before pressing it, unless you're feeling brave.
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