My iphone 3G Backlight keeps turning off and on every 15 - 20 seconds.

My iphone 3G keeps turning off and on (only backlight) every 15 - 20 seconds when in sleep mode. When I say turning on and off, it is not switch on-off, it is only back light that gets turn on and off. This is causing the battery to exhaust quickly.

First, try to reset the phone by holding the sleep and home button until the Apple logo comes back again.
If the problem persits, set it up "as new device". If this does not work, do it again, this time not using the backup after the new set up.
If still no luck, get it serviced or visit your nearest Apple Store.

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