1999/2000 computer-crashing problem? (10,3)

I believe the answer is:

millennium bug

(Other definitions for millennium bug that I've seen before include "Hypothetical virus that didn't cause global computer chaos on 1/1/2000" , "2000 PC prophesy" , "Forecast software problem for New Year's Day 2000" , "IT glitch" .)

I've seen this clue in The Guardian.

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