Chosen Solution
I can use iphone for a few minutes. Then when I inlock it I need to restart it, sometimes. Otherwise the screen won’t respond. The problem only appeared after a screen change. How do I solve it? Thanks
Try reseating the connectors in place again, maybe they are slightly misplaced. Don’t forget to disconnect the battery before removing the screen. If that doesn’t help you might have a glitchy screen.
It sounds like a bad screen to me. Was it replaced at a repair shop? If yes take it back to them for warranty on the screen.