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Mine just started doing this,
Hardware: A01, Rom: A02 second release.
Never used screen protector, no debris in the button-cover at the bottom of the screen, even though that is the part of the screen that the screw-up is manifesting.
I can put it in that drawing mode, and everywhere but the bottom of the screen is fine, but i can simply draw a single dot at the bottom and after 1/2 second it draws a vertical line on its own.
Hope there's some way to fix this myself, i'd hate to have to deal with dell support again.
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