Chosen Solution

My iphone 6 does not respond to touch when left idle on stand by for sometime, like when i sleep and wake up or 30 mins - 1hr , it starts responding by tapping the upper parts of the screen. The screen has been replaced before, but it still does it. What could be wrong with it and is there any solution, temporary or permanent. I have to put my phone to never sleep, and thats draining my battery .Thank you

it could be a problem which the touch chip if it had the same problem before the screen was replaced