Water Damage, screen and battery replaced screen responsiveness

I have an iPhone 5S that was dropped in water. We took it to a local repair shop who took it apart, dried it out, replaced the screen and battery. It will now power up and the screen will be responsive for a few seconds and then doesn't work. If we put it to sleep, then back on, everything works again for a few seconds then stops.

What could be the issue?

Thanks!

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