clean out your charging port with a plastig tooth pick or something similar. Lint from you pockets get stuck in the charging port, and each time you charge you phone, it gets more and more packed and eventually hinders your charging connector to fit properly in the port.
I have changed displays on iphone SE. Copy screens had all kinds of errors, interlaced picture, colors are bleeding out from app icons and moving around alittle. Original 5S screen worked fine, but now 2 days afterwards a customer contacted me that the lighting is off, and sometimes the touch stops working. So she will be back this monday. Odd thing tough, when I removed the broken screen, there were no Apple logo on the flex cabels connecting the lcd&touch to the mainboard in the phone. instead there were 4 dots in a squared form. looked like a copy screen basicly.