2019 Honda Pilot wipers, windshield & visibility problems

When I was backing my car, I saw a white car approaching from my rear end camera but there was no sound or warning sound as usual. I stopped my car until the car passed by. Then I started backing slowly without seeing any car moving or approaching. Suddenly I saw an old dark green honda crv car on my rear back camera came from nowhere with high speed and no warning or sound. I pressed my brake immediately. I did not feel any pulse or collision. When I drove home and found a small damage on my car rear bumper.

The passenger side mirror won't stay at the proper adjustment. You set it and it drops in a few minutes so you can't see the cars behind you. When you drive you have to keep adjusting the mirror. It's a small problem but could be a big problem if there is an accident.