[derekdal]

is the switch in the correct position? it has intermitant

 

[derekdal]

The system is spot sensing with a camera using a rather small area of windshield, depending on sensitivity set by the driver as noted above. There is no water sensor and other things on the glass may trigger it lime bug juice, maybe certain kinds of dirt and angle of sun if there are glass pits. Welcome to the inaccuracy of AI guessing. It's not really a defect and easily avoidable with turning off the wipers entirely as noted above