IPhone display lights up for half a second...

My new iPhone 4 does the same my old iPhone 3GS did. Sometimes when I push the slepp/wake button to wake it up, the display lights up for half a second and goes dark again. This always happens twice. Only when I push it the third time, the display stays on. Since it's a brand new iPhone 4 and the old iPhone 3GS did the same, it must be software related. I've had it with iOS 4.2.1 and iOS 4.3. Does anyone know this phenomenon too?

I get that occasionally. I've always assumed it was to do with the proxy sensor and the location of my paws on the device at the time. It's not consistent and rare occurrence.
Also, i use the Otterbox cover for it. I think it's design allows buildup of dust on the proxy and also could be contributing to the same theoretical cause.
Message was edited by: Beavis2084

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