Screen freezes and I have to do hard reset

Hello every one as phone repair technician I would like any expert to help me with one problem that I am trying to figure it out.

My iPhone 6S Plus old screen was giving me problem sometimes flickering I was doing ok with that. Everything was working completely fine. But one day I decided to replace my screen and I did it. So after replacing my screen now the problem that I have is very annoying. Screen freezes and I have to do hard reset every single times that happens.

I cleaned all the connector very well but still same problem freezes.

But the weird part is that if I put back my old screen the screen works fine but just flickering one and a while. Oh and by the way during night new screens don't freezes so I am confused.

Any opinion?

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