Home screen goes blank after making calls with OS 4.0 (3G)

Since the OS 4.0 update, my home screen keeps going blank (black) after making/receiving a phone call. I have to turn the iPhone off and back on again to gets the Apps back up on screen.
Anyone else having this problem?

I have had a similar problem. After I make a call, the screen goes black and a random keyboard comes up and does nothing. I have to wait for a while untill it works again

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