So I've been neglecting my smoking duties as of late, and decided to grab a few racks of baby backs last weekend. Everything went as normal, and when I opened up the door to add some wood about 1-1/2 hours in, I noticed black "flecks" on top of my little beauties. I thought "gee, that's odd", grabbed a dry mop brush, dusted the ribs off, added wood, and let it go. At 2-1/2 when it was time to foil, there was more on there than the first time. I peeked at the underside of the top of the smoker, and the coating was peeling off. Upon closer inspection, there were spots on the back corners that look like they are starting to peel as well. The section on the top that is peeling is about 8" in diameter. Sorry, I did not take pics, even though that would probably been the smart thing, I'll take them when I get home. I re-brushed the flakes off the ribs, foiled and finished on the grill. Is this normal? I do not overheat my smoker, pretty much always between 225 & 300 depending on what I'm doing. How do I keep it from happening? The unit is only a year old, absolutely no problems up until now. Thanks in advance for the help.