I'm thinking vibration. Walking, biking, car seat, putting down on hard surface.
All of this flexes the solder connections of 6 connections. A hairline crack will develop in time. But you are not going to the moon. Lives don't depend on these connections. It can be fixed.
In the 1960s, the 1/2 watt (or 1/4 watt, I don't know) resistors used by the military in some projects cost ten dollars each. Because of the testing of each one, or each production run, again I don't know. So a 2 cent resistor cost ten dollars. Mil spec.
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