I have kind of noticed this too, but i think it has been about the shape of the phone and me touching just a wee bit on the edge of the screen with part of my hand so it's not registering my finger just right.

Been able to eliminate the first problem when i noticed the above, but it's of course another story of some of you have actual hw faults.

Also as it has been raining for past 2 weeks non stop in here Finland i have noticed the droplets mess the responsiveness of the screen more easily than on GS or ip4.