Hey all. I am having trouble with my 3GS touch screen. it locks up and freezes and is inoperable until i either put it to sleep and then wake it up or shake the phone. I had previously gone to the genius bar about a week ago they said the connector to the touch screen was loose and they fixed it. Sure enough it started doing the same problem again and being a little more unresponsive at times. i am going back to the genius bar tomorrow. I am fed up with trying to make it work. What i was wondering is do i have the right or can i demand a replacement phone? my 3G never had this problem. I personally think the touchscreen is defective. the build week numbers are 926. what do you all think? Can i demand a replacement? any advice is appreciated. Thanks.