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Once, many years ago, when I worked as an IT guy on a small company, I was asked to help fix a problem with a computer that seemed to reboot while the user received phone calls from the boss. It never happened during other calls or when working on the computer.
I replaced all the cables and we moved the phone to another side of the desk, and switched network jacks and phone jacks. Nothing helped. Now and then, always during a call with the boss, the computer would reboot.
I passed by after a few weeks and saw the user was in a call. I later found out that it was the boss. I stopped and watched. After a few minutes the user pushed back slightly from the desk, leaned backwards in the office chair, turned the chair a little towards a big calendar on the wall, and crossed one leg over the other and started to wiggle the foot up and down while the phone conversation continued. The wiggling foot was now just a few centimeters from the reset button on the computer.
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