No persistent WiFi on 3GS running iOS4

One of the new feature on iOS4 is Persistent wifi even after you lock the phone. This is great for me since I'm on the 200Mb/mon data plan, and my iPhone 3GS is doing alot of background activities that consumes data while I'm at sleep, for example: fetch emails, push alerts, Exchange push...
What I've noticed after a month of iOS4 use is that the persistent wifi doesn't work as advertised, sometimes it works, but most of the time it disconnects me from wifi a moment after I locked the screen.
Anyone has answer to that? Is there an option to enable/disable the persistent wifi?

Basics from the User Guide are restart, reset, restore.  Have these been tried at all?

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