Faulty hardware is a completely different problem, which has nothing to do with the (incorrect) notion that all eInk has an inherent finite lifespan because of contrast fading. The later simply does not exist.
I suspect that when the original poster said "I've read some comments saying that e-ink screens lose contrast over time and thus have relatively short lifespans."... what he's referring to are comments about the initial fading that occurs with brand new devices (which stops after the first few weeks), and misinterpreted those comments.
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