How do I fix an intermitent screen problem?

How do I fix an intermitent screen problem?

The top 1/4 of the screen will show legibly, but with multiple missing lines. The bottom 3/4 is dim with many fine lines. When I reboot the device it sometimes comes back with good display. Sometimes not. If I wait a few hours to days, it will come back on it's own. Note that the device will still sync to computer and play audio even when the screen is malfunctioning.

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