6 + Grey Bar at top of screen, screen un-responsive

Two weeks ago I noticed that a small grey flickering bar would appear at the top of my screen when unlocking my phone. Sometimes it would just go away and other times it would linger and my screen either: would not accept any touches, or the touches would register incorrectly and open un-wanted apps or type wrong things.

Took it to the Apple store last Saturday, Genius's looked at it and saw the issue, did a screen replacement. It is now one week later and the issue just re-surfaced. I am about to do a full restore on the phone to see if that helps.

Anyone else with this issue???? I will post an update after the restore. None of the people at my store had seen this issue before.

Thanks

-Tom