Top screen doest not respond G920FXXU2COH2

I made an update yesterday for the French firmware (BOGS TO COH2) android 5.1.1 especially to solve this problem. My screen works perfectly but the top of it doesn't work when I tap. I downloaded a multitouch app. And I found that the swipe works perfectly if I came from the bottom. So I think that it is a software problem.
Some permanent solution?

Edit: rebooting the phone solves the problem for a while.

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