Tail Light Switch problems of the 2010 Cadillac CTS

My rear tail lights for my wagon have separated from the top of the car due to poor design. Spoke with Cadillac & gm, both refuse to believe it's a design flaw on the wagon models. Both stated car out of warranty due to mileage/year. Asked if they could tell me what was used to attach lamps to vehicle, neither has a clue. Dealer wants $2100 to replace, but no guarantee that it won't happen again. Since January 2019, car has been to dealer 3 times for car not starting on 1st try. First time, negative battery cable tightened, 2nd time replaced positive battery cable, 3rd time dealer has no idea as to what is causing the issue. All lights on dash come on, engine does not turn over while parked. It will start on the 2nd try, sometimes it hesitates. Dealer told me to continue to monitor until vehicle breaks down.

The contact owns a 2010 Cadillac Cts. The contact stated that the rear left and right top plastic retaining lamp fell off. There was a one forth inch of space between the tail lights and the body of the car. The manufacturer was contacted and did not offer a remedy. There was thirteen tail lamps replaced on the vehicle. The failure recurred. The failure mileage was 5,322.

The tail light lens do not fit properly. They warp out at the top ends, causing very sharp protrusions that can catch your hand when washing or wiping the vehicle. These were replaced with new ones at the dealership. However, after a few months the same condition has re-occurred. This in my opinion is a safety issue that should be addressed by manufacture. I have managed to cut my hand on more than one occasion because of this condition.