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This would be a good explanation for an outage in March or April 2020, not so much in January 2021.

There may well have been a bigger delta in usage from Sunday Jan 3 to Monday Jan 4 2021, than for any particular pair of days in March-April 2020.

Of course 2020 saw an increase, but it was smeared over a week or a month rather than being a big jump in a single day after everyone's holidays.