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The boards can get damaged in accidents and perhaps by water intrusion, so I wouldn't be surprised if the shop needs to replace them on a regular basis.

Just plain old MTBF says there will be (some) early failures. Nobody's perfect, and outlier conditions, like really high temps or humidity, high salt, etc, exist in some buyer environments. And, as you mention, special circumstances like crashes, fires, theft/vandalism, and flooding.

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