Today my back parktronic sensors died!!!

Out of clear blue sky I moved to "reverse" and instead usually obstacle sound (beep, beep) I heard terrible 5 seconds "Beeeeeeeep" (There weren't any obstacles behind me so that 5-sec-beep was obviously signal of malfunctional parktronic system).

I have to mention that few days ago were very rainy. Maybe tiny wet filter appeared between sensors ????

I am LOST without parktronic so PLEASE HELP ME!!!

Any idea?

Thanks a lot
Niksa