The contact owns a 2021 BMW X5. The contact stated while the vehicle was parked, the starter failed to respond. The vehicle displayed three different messages repeated start attempt, Auto Start/Stop flash stop deactivated, and the drive train service technician required. The vehicle intermittently displayed various messages, and the vehicle struggled to start or there was a delay while starting the vehicle. The vehicle was taken to an independent mechanic where the starter was cleaned, and the contacts were cleaned. The vehicle was repaired; however, the failure persisted. On another occasion, the vehicle was taken to the independent mechanic where the vehicle was diagnosed with engine starter failure. The local dealer was contacted; however, the vehicle was not repaired because it was not under recall. The vehicle was not repaired for the most recent failure. The manufacturer was made aware of the failure and referred to the NHTSA Hotline. The failure mileage was approximately 62,300.