NHTSA Complaint #11677528 — 2015 CHEVROLET TRAVERSE

Every so often, when I brake, just before the car should come to a complete stop, the engine seems to rev and the car will keep moving forward a few feet. Chevy dealership had 3 different service technicians drive the car to try to recreate the problem, but since it is a rare occurrence, they did not experience the issue. Googling the scenario returns many who say it may be a vacuum leak in the brake booster. Dealership said the brake booster is fine. Floor mat interference with the gas pedal has also been mentioned. I removed the floor mat, and I still have the issue. Dealership said the brakes themselves are fine, and the diagnostic tool returned no problem codes. They also searched for any recalls, but none were found. Any insight provided is appreciated.