I'm beginning my second season with my BK. I came in the family room to check the stove (Which I seem to do quite often) and I've got the air control set low. Cat probe is reading about 2 o'clock on the dial. Mostly just red embers inside. But when it gets the occasional flare up when the smoke lights off it's quite a violent flare up. And it sounds like it's the bypass damper is blowing open or something. I've never heard this sound before. Is this normal?