IPhone 4: screen blinks rapidly and goes blank

For several days now my phone's screen will start blinking rapidly then go blank. First noticed this after disconnecting from my computer after a night of recharge. Now it happens at random times, but several times a day. I cannot restart the iPhone in this condition; the only thing that works (and it works every time) is a reset. So I can always get back up and running. But this need to reset several times a day seems odd. Any ideas?

Ten days or so back, the Apple store gave me a new iPhone 4 because my original one I stood in line for seven hours to get would simply go dark with no screen blinking. Now my new one is doing the rapid blink bit and sometimes eventually goes blank but at other times seems to keeps blinking until I can shut down and reboot. On a couple of occasions it appeared to be cycling through different apps that either were, or had recently been, open. The only common trigger event I have identified is unplugging the USB or headphones, but that is less than 50% reliable trigger event.
On the theory it might be related to an application, I have been scrupulous about updating all my apps and I have gotten rid of some that have not been updated since iOS 4 was released, but I could easily have missed some. Other than the apps, the only thing common to both iPhones is the SIM card?????
I have another appointment at the Genius Desk, but the first available slot when I made it Wednesday night is Wednesday of next week. I have just tried your reset all settings idea but I am not canceling next week's Genius Desk appointment yet. Hopefully I will be able to cancel because your "fix" worked.

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Hello, Chantal105
Thank you for visiting Apple Support Communities.
If your device is in recovery mode you will need to restore the device.
If you can't update or restore your iOS device
http://support.apple.com/kb/HT1808
Cheers,
Jason H.

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IPhone 4: screen blinks rapidly and goes blank

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