Customer's "virus" was actually a dying CMOS battery, my fault for doubting it

Last Tuesday a guy comes in with a Dell OptiPlex that kept losing time and throwing boot errors. He swore it was ransomware because his clock would reset to 2001 every morning. I rolled my eyes internally, figured it was just Windows being Windows. Turns out that little CR2032 was dead as a doornail, reading like 0.02 volts on my multimeter. Replaced it for $4, ran a full disk check, and the machine booted clean for 3 straight days in my testing bay. I was so sure it was a driver conflict or a sketchy startup program, but nope. Anyone else had a client diagnose their own issue dead-on and you ignored them? It's making me second guess how I filter customer stories now.

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