Poor engineering or bad quality control. It could be either. The bad quality control is pretty obvious. If a certain component is out of spec, then obviously the system could behave out of spec as well.
Bad engineering. Maybe its a new electronics engineer that didn’t properly take into account thermal characteristics and is throwing the crystal oscillator out of wack. Or maybe they aren’t seperating analog and digital grounds properly and its causing unexpected behavior in the system. It could be any problem, but those are just some examples of engineers not taking into account parameters that affect the system.
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