I need some advice, I have notice some quite deep pitting appearing in the bowl of one of my briars, never had the problem before, I noticed it after the bowl got really hot during a fairly long smoke whilst fishing. After the bowl was emptied I saw the charcoal pits in the wall of the pipe..... Argggggh!. So 3 questions: 1st What caused it? ...2nd what can I do to stop it happening again...3rd What can I do to save my pipe ?