Same issues..
I have been having the same issue as many in this thread. However I have 2 deads spot. One midway on screen and the VERY bottom, where the nav buttons are suppose to be.
I have been using pie control on right side of screen and disabling nav buttons since they are render useless without touch control.
In terms of everyone else suffering from these issues, if you play with LCD density you may be able to get everything to come up where you have no dead spot. That is what I did.
I am on At&t's 12 month plan with this phone and that is up in April. Not sure if I am going to bring it back to At&t for warranty or not. If anyone has any other suggestions please let me know!