KBFA20ERSS Refrigerator: Making buzzing sound for a few seconds every minute+/-. Door frames are 90 degrees +/-. Interior near room temperature. Compressor is running. Happened 2 times before in last six months. Unit returned to normal after 24 hours, still buzzing sound, with much frequency. Unit has been in this bad state for 3 days and not returned to normal. Intermittent buzzing continues.