Part of screen has become unresponsive

Suddenly part of my Iphone 4 screen has become unresponsive. In vertical screen mode, it's the bottom R.hand corner and selected other spots near the bottom of the screen, e.g. the back button, z,c,and m keys. It seems to be the same area of the screen when turned into horizontal mode, so that there it's e.g. the send button in mail. In the phone, pressing the back symbol brings up the # sign, just above it - so if I make a mistake hitting the phone keys, I can't undo it without powering down then re-powering up.
There are no scratches on the glass, and I have tried re-setting the phone. I have the latest Itunes and ios. Any ideas?
Thanks,
Richard

Here are some ideas:  iPhone and iPod Touch: Troubleshooting touchscreen response: http://support.apple.com/kb/TS1827

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