Kenmore Ice Bin Freezes Up?

I have a 2008 Kenmore Coldspot refrigerator, model #106.58912801. The ice bin freezes up about every two days. The door chute assembly was replaced by a Sears tech approx. 2years ago. I have cleaned it out numerous times and inspected flapper assembly with a flashlight. (no light shows through) Also I have noticed that the middle pillar section between where the doors close around ice bin area appears very warm to the touch to me all the time. Any ideas? Thanks.

By Bob