The contact owns a 2019 Hyundai Santa Fe. The contact stated while the vehicle was either stationary, parked, or being driven, the seat belt buckle failed to operate as designed. The seat belt warning light was illuminated. The contact stated that during the colder months, the seat belt buckle was more difficult to latch securely. The local dealer was contacted; however, the vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 85,000.