By disconnecting the main battery, letting it sit for a few hours and re-connecting it got the device to restart and clear the screen. So it seems okay for now. And honestly, I don't want to go through the hassle of shipping this back to China even though it is a relatively pricey device for what it is ($210). That's what I came here to see if anyone else had issues or comments about doing something DIY in this situation. Thanks for the possible diagnosis (screen controller) in case it acts up again. The cover it came with is nice but it has magnets. It might be causing it to wake up and sleep too much. I may carry it in a padded sleeve and not use the case.
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