The original Aura H2O is nine years old, which is pretty old by electronics standards. The v2 is from 2017, so it's not exactly new, either. Do you expose your devices to large temperature changes? It's possible that even though you're not using them as frisbees, the expansion and contraction of large temperature variations could be causing the screen to flex and crack, I suppose. E-ink screens are quite fragile compared to LCD.
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