Kenmore Refrigerator. My refrigerator model# 106. 9550751 serial # SF5146680 Right now it is set

Question

My refrigerator model# 106. 9550751 serial # SF5146680 Right now it is set on highest cool point. When it runs, it is fine it makes ice and everything is very cold, but when the fan turns off, it doesnot turns back on quickly. It takes maybe 8-10 hrs. we have to take all the remaining ice out from the ice basket and then it turns on. please advice