IPhone Backlight Intermittently Does Not Turn On

I have been experiencing a weird issue with my 3GS where sometimes (very infrequently ~once every other day) when click the home or sleep button to turn the display on the backlight does not come on. I can see the stuff on the screen but its really dim because the backlight isn't on. I can interact with everything but the light just isn't on. If I lock the phone and then hit the home/sleep button the screen turns on fine with the backlight on.
I went to the Apple store today and they "reseated" the cable but the problem is still happening.
Anyone have any idea? Is this software related? Hardware? I had a 2G iPhone before and this never happened. Does this happen to 3G owners? Or is this purely a 3GS issue?

My original iphone developed problem with mute switch. On 7/14 I made the two hour round-trip to the apple store where I received OUTSTANDING service and a replacement phone. In the past 5 days, the backlight has become a real problem and I can now make the backlight fail by simply shaking the phone; don't think this is part of the "shake to shuffle" feature of the ipod
Opened case with Apple support and was asked to "reset" the phone and then "restore the phone". After trying both; problem still exists. Knowing that shaking the phone results in the behavior, the problem is most likely a connector. However, I cannot afford to make another 2-hour round-trip to the "local" store. Apple support has been great so far and I sure hope to report back a positive result from this incident too.

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