What's the most most mysterious bug you've ever encountered that later turned out to have a trivial explanation?
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Mainframe would mysteriously crash (sometimes) at exact multiples of 3 days, 17 hours & 4 minutes. Eventually IBM engineer opened all the doors & everyone watched as the time approached. Tiny water droplet fell, hit a fan & splat into memory core.
"Hardware fault: plumber called"
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Tbh I don't recall the exact period, but should have explained the IBM3032 was water cooled. It took that long for condensation to build up to the extent that a water droplet formed, fell into the fan and hit main storage. Or not. Plumber fitted a part to divert the droplet.
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