Unresponsive iphone 4 screen?

I received my iphone 4 in the post 2 days ago. I have had constant problems with the screen becoming unresponsive. It seems to work most of the day, however sometimes it will just freeze up and the touchscreen will be un-responsive. The manual buttons on the phone still function, just not the touch. I have tried re-setting the phone. This doesn't appear to do anything and the phone can sometimes be unresponsive for up to an hour. Any ideas or fixes?
Cheers!

It doesn't appear that anyone has posted to this thread in quite some time. However, I am having and have had this issue for quite some time now. My iPhone 4 (4.3.5) touch screen freezes periodically and actually pretty frequently. Theres really no rhyme or reason to when or why it does it and I don't recall ever having this issue before upgrading to the latest iOS update.
Most of the time what I am able to reslove the issue (temporary) is pressing the power button. On occasion I have shut the phone all of the way down and restarted it.
Here are the issues that I am expereincing:
Call finished and unable to end call on touchscreen
Incoming call touchscreen will be unresponsive and unable to answer
During call have another call come in and touchscreen will be unresponsive, cannot ignore, answer other caller...nothing
Press the home button to wake the phone and the slide to unlock will not slide
Press app icon (any app) and the icon idicates that I have pressed it however, the phone does not respond and the app does not open.
I took my phone into the apple store and they ran diagnostics on it and could not find any issues other than a few dropped calls. The "Genius" that was assiting me told me that my iOS must be corrupted and that we needed to do a complete restore. So, thats what we did and I left the store. I'm not sure exactly how long it took for it to start happening again but it wasn't long. In fact I'm not sure that restoring it did anything at all.
So...I'm not sure what is causing this and I don't know what to do about the issue now. I pre-purchased my iPhone 4 when they came out and have had it since then (out of 1yr warranty and did not purchase applecare).
I do wonder if I could possibly have a "bad" app installed on my phone that is causing this to happen.
Any ideas or suggestions would be very helpful...I am really frustrated at this point.

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