You should be testing everything.
Checking voltages, checking resistor, check resistance each cable core.
Check evironmental issues, PIR age, position, time of alarm - night, day.
Temperature of room, heaters, air conditioners near it, windows, curtains.
Check the type of PIR, is it appropriate for that type of setting.
Check for critters, rodents, lizards, frogs, cats, dogs, rats, possums, kids, etc
check, check, check, check, check everything, exhaust all avenues.
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