I have a Hitzer 608 coal stove and about 3 wks ago, the control module light went out for about 15 mins. After about 2 hrs, I opened the door and it went out again. I previously cleaned the unit a week before this and had no issues prior. Every now and then, whether you open the door or ash door, it goes out and comes back on within 5-10mins. Today, it went off without doing neither. Any suggestions? Hitzer said it may be wind loading depending on which direction the wind is blowing.