Mine too so it's double-trouble?!Sorry for the echo in the line, my internet connection is weak.
Just read your response to Brobs, are you smoking CB in it? If so, I'd be more likely to blame it for the surprise bites... if it bites you towards the end it could be from heel moisture. I'd hang on to it until you get a few more briars to compare with.. just my opinion! Also, there are some mini files that could potentially fix most airway problems. I have a nice pipe that I inherited from my grandpa that smoke wet and only passes a thin chenille cleaner. I dedicated it to dry oriental blends and now it does just fine. The only thing I can't tolerate is a very small airway because they tend to cause bite no matter what I do.