iPhone XS going off

I try Good day, trust you re good . Please I recently changed my IPhone XS battery and phone screen. I changed the battery because it was on service and it was swollen, also changed the screen because it was cracked. I notice after the replacement, my phone keep going off, it only comes on and work properly when the screen is not screwed to the phone. The moment I try putting the screen properly to the phone by screwing it then my phone goes off, it only comes on again when I detach the screen from the phone . Please what could be wrong