My GF has an S4 and I have an S4 Zoom and both of them have the same problem For example, if you are in the camera app, and you take a photo, if you click on the bottom left to look at the preview of that photo in full screen. nothing happens, until you have to presss like 5 times and if you were lucky the phone's touch screen will respond and go to that photo. this problem also happens sometimes in the Google App Store, no touch works I have to force close the Google Store then reopen it then the phone works normally. I checked the software but my phone already has the latest it says Anything I can do? or must I wait for a software update? or do all these phones suffer from this problem?