I have spent 25 years taking telemetry and tracking systems from the lab to the field, and the failures that cost the most were never the ones we tested for.
A battery that was supposed to last ten years and would not make five, because the real wake-ups were longer than the math. A parked truck that kept adding kilometers, because a stationary GPS is never quite stationary. A Raspberry Pi that slowed down while Linux swore it was running at full speed.
None of them showed up on the bench. All of them showed up in production.
What is yours? The failure that only appeared once the device was out there: in a cabinet, on a pole, in a truck, in the sun. What gave it away, and what do you test for now that you did not before?
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