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That's usually a hardware issue... I had the same with a replaced eink display for a 1st gen H2O, was fine for a while then got a line like this. Re-plugging cables or anything didn't help, this happens internally somewhere either the display itself or its builtin controllers.
Since I ordered the display from china, I don't know if its a quality issue, compatibility issue or just rough handling during shipping. It's not water damage since I don't trust the "waterproofing" in the first place anyway.
On the plus side, the damage didn't spread any further... still the same line today, although I don't use the device anymore.
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