Weird touchscreen response while charging iPhone 4.?

Hi,
I used to charge my iPhone 4 via USB Chord using my laptop only. But recently I shifted to charging it through the power adaptor which comes along the Apple iPhone 4. But during charging, my touchscreen acts weirdly, I touch somthing and some other app opens.. I cant even unlock it during charging..
I am using the Official Apple Power Adaptor and the Official Apple iPhone 4 USB Chord which comes inside the box along with Apple iPhone 4.
I even tried charging my iPhone 4 with Official Apple Power Adaptor BUT WITH the USB Chord of Apple iPod Classic also. But the problem still persists..
I have tried charging my iPhone with its cover on and even without its cover on.. But no relief..
Please help me out.
Thanks in advance.

I am having the same issue on my iPhone 4S. While charging, the touch screen will perform wildly inaccurately. I will touch one spot on the screen and an entirely different section of the screen will react.
I bought this in to the apple store and got my phone replaced under warranty.
Still, my new phone is having the exact same problem. This is incredibly frustrating, especially b/c I try not to charge my battery until it is very low (as you should with LI batteries). This often means I'm charging my phone during the work day and cannot use it b/c of the screen issue.
Could it be a software issue since I am experiencing this on two different phones?

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