My step-grandfather kept his computer in the basement or spare room--some place outside of the main flow of traffic. When it stopped working unexpectedly, he took it to a repair shop. They removed several pounds of dry dogfood that enterprising mice had stored in there. It ran much better after that.

Shades of Pi (or maybe Rucker's The Hacker and the Ants, except that these ones are real rather than virtual).

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