Start with the kind of change

Is most of the frame moving?Yes: stabilise the camera; check vibration, auto exposure, and large lighting changes.Is the change in one area?Yes: add an Ignore zone over a window, screen, tree, fan, or reflection.Is baseline motion continuously high?Yes: raise the Reaction Threshold carefully, then repeat a representative test.Only when light changes?Reduce changing light where possible and test daytime and nighttime separately.Is the intended movement small or distant?Move the camera closer or narrow the Watch zone; a lower threshold can also react to more noise.

Check camera movement first

A loose mount, table vibration, opening door, or cable movement can affect most of the frame. Secure the camera and wait for the image to settle before changing a threshold. A moving camera can create monitoring gaps as well as unwanted alerts.

Use zones before broadening sensitivity

Make a Watch zone around the area that matters. Use Ignore zones for windows, trees, screens, fans, reflections, shadows, pets, or other recurring background movement. Zones do not identify what moved; they simply exclude or focus parts of the image.

Calibrate with representative conditions

Run the Motion Sensitivity Test while the scene has its usual light and movement. Treat its suggestion as a starting point, not an optimal setting. Repeat after changing lighting, camera position, or the monitored area.

Suspension is a different problem

When a browser tab is hidden, the device sleeps, or camera access ends, monitoring can pause or stop. That is a monitoring gap, not a false alarm. Keep the page open and the device awake while monitoring.