Hi Alfie.Evans2020,
Frequent false alarms are often caused by environmental factors such as shadows, headlights, rain, or moving vegetation. Please reduce motion sensitivity, adjust the detection area, and enable filtering options such as object size or target classification if supported. Positioning the camera to avoid strong light changes is also recommended.
I would recommend using Line Crossing or Intrusion Detection instead of Motion Detection.
Please let me know the model of your recorder and firmware version and I can send some instructions on how to configure line crossing and intrusion detection.