You probably know that one way to avoid chatter on a boring tool is to keep a fairly good depth of cut and feed. That is okay when you are boring in but a lot of times a boring tool will chatter on the way out because it is not really cutting just rubbing so there is no load on the tool and nothing to stop it starting to vibrate and things go from bad to worse.
There are boring cycles where you stop the spindle at the bottom with an orient spindle command, then move the X or Y axis so the tool is not touching and pull the tool out.
An open mind is a virtue...so long as all the common sense has not leaked out.