I phone 4 goes dim/dark during use

Replaced a cracked screen, phone comes on fine but after brief usage the screen goes dim/dark. Pressing the sleep/awake button on top will usually bring it back to normal but it continues to do this until I do hard reset. If I hold the phone at an angle, I can still make out that there are icons, phone is still on, calls and alerts still come through. Have done sleep/home buttons reset. If it were a connector issue I would think the screen would not come on at all... Any help would be appreciated!

Try hard reset. If not Resore as new iPhone. iOS 4.0.1 Made signal much more reliable. Unless of course at&t service is actually alot worse than previous phones showed.

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