That should not have caused the issue, however, I have a feeling that we start seeing more and more such behaviour for K3s recently. I think the consensus for now was that the e-ink controller is failing in such cases. Not a lot you can do there, unfortunately. I guess corrosion damage might be a plausible scenario given what you tell about the stressed life of your device ;-) - note that water damage, especially for small amounts, might show up pretty late, when the minerals from the water trigger/catalyze corrosion.
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