PIR fan triggered by interference

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7 Apr 2021
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United Kingdom
The Manrose XF100PIR 4 Inch Toilet Extractor Fan with PIR I fitted in a downstairs loo starts for no reason in the evenings, sometimes three times, sometimes not at all, but usually at least once.
Nothing in the room moves (towels, mirrors, gloss paint, all been checked).
The isolator switch is in the understairs cupboard next door, next to the router power supply.
Be grateful for any ideas what might be triggering this?
Maybe it's poltergiest with a weak bladder ...
 
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