Peugeot 407 Parking sensor problem please help

Friends, when I first received the parking sensor of my 407 vehicle, it was problem-free, but in the following times there was a problem. The parking sensor started to detect at a very close distance, it would start from the obvious longer distance, and as the vehicle approached on the screen of the trip computer screen, I guess there were 5 lines in total, but now there are only 3 lines nearest. Recently I realized that water is entering the trunk of the vehicle, although the clips of the back cover are not attached, so there was some wetness in the parking sensor cable. What do you think the problem is caused by? How can I tell from the brain or cables? I have a Lexia device and no errors.

I also had peugeot partner tepee (2011), he did the same after washing the car. After a few or two were installed, they all got better. If you have a dryer machine, dry it, clean it and put it back into gear a few times, otherwise you will take it to the service. Is there any problem with the tape. Because the sensors are connected to tape

There is no problem with the tape, my teacher sounds, but it starts when it is very close. If I do not clean the brain with electronic circuit cleaning fluid first, I think it is a problem with the cables.