Change in motion detection algirythm?

I have been using a number of wyzecams to record the flickering of florescent light fixtures in order to identify which bulbs it was that flickered. This works very well. But all at once about a week ago i stopped getting these motion events. I find it hard to believe that the lights are all just working well now. And chance they motion detection has just changed?

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the flickering might have changed just enough that the frequency of the flicking is not picked up by the camera.