Moisture will build up if the refrigerator door is obstructed or not sealing properly. Verify nothing is blocking the door from closing and the door is sealing all around the edges. If you have any concerns, please be with your product and contact Hisense Customer Support on 1800 447 367. Hours of operation are Monday to Friday 8:30am to 7:30pm AEST and weekends from 9am to 5pm AEST