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oscillating HC-SR501

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g2c

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Hello everybody, My HC-SR501 are reworked to non retrig configuration Additiannally, I removed the sensitivity and pulse width pots and replaced them respectively by .5Mohm and short which set the device to ~7m detection an 3" pulse width.
Yet, at random times, one of my modules module generates a train of 3" pulses which is interpreted as an alarme (I consider 5 detection in 30" as critical motion level) and this renders the module nearly worthless!
Someone have had such an observation?
What can be done?

PS, powering the device at less that 4V creates exactly the same oscillation. My modules are powered by a clean steady 5.0V

Thanks!
 
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