my radio will not turn off when i turn off ignition

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like your 2015 Buick LaCrosse might be having issues with the Retained Accessory Power (RAP) system, which keeps the radio and other electronics on until you open a door. If your door was left open all night, it could have drained the battery, which sometimes causes these systems to glitch. The issue with the lights and radio not behaving properly could also be due to a faulty door switch or a body control module (BCM) problem. The door switch tells the car when the door is open or closed, and if it's malfunctioning, it might not be signaling to the RAP system to turn off the radio. If the problem persists, have the door switch and BCM checked. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.