screen off while back cover partially open

i have a problem in my A70 , i replaced the screen after it fall down , then after a week the back cover started to open partially from the down left side opposite to back camera side .

once this happens , the screen turn off and not responding but phone is alive and receiving calls and messages.

once i opened back cover , the screen is alive again ,i cleaned the old glue the seal it again ,but after a day the scenario repeated again.

what is the solution for this?