Debugging Methodology — question 9 of 10
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A control board works perfectly on the open bench, but once you close it into its enclosure it glitches intermittently. Opening the enclosure to probe it makes the glitch disappear again. Design a debugging plan: what hypotheses would you form to explain this (thermal, EMI, mechanical/connector flex, light-dependent sensing, grounding, or the act of opening the case itself), in what order would you test them, and how do you deal with the fact that observing the system tends to change it?