I tried several things in the past. but the bumpers after a while keep "falling down" up to 1/2 inch. The front bumper also comes off the the left side, right @ the front left wheel. it has a screw with a washer, i always fix it but it comes off again and again. I noticed several Nissan Sentra on the streets with the same problem! the last one I saw had the rear bumper stitch with duck tape. we where driving the same road, and after a while @ a red light I noticed the bumper came off almost completely off the other car.. I am sure this is a recurrent ploblem that has to do with a weak design of the attachment of the bumper to the car. Any ideas on how to fix it? without payind $$$$$$$$$$$$ at a repair shop thanks a lot.