I have a GE side by side refrigerator. The model is 197D1078P050. From 4 month later I have a problem about the frost in the freezer. In the internal body refrigerator every 15 days I have a lot of frost and I must to turn off the refrigerator and after about 4 hours when all frost to be fuse, then turn on it. I called to responsible in my city and he checked the system and say the grill and sensor are true but he guessed the timer of the defrost system was not true. Unfortunately he didn't find the timer because the refrigerator was older than his experience. Would you please help me about this issue? I want to solve this problem if it's possible.