I'd experienced an issue jointing wider Eastern white pine boards, where the shavings would get caught up in the throat of the cyclone and clog it without ever setting off the alarm. A change to the flexible ductwork may have actually solved the problem quite by chance. My flexible ducting was about eight or nine inches longer than it needed to be, and this caused a problem pulling out and emptying the drum of shavings/sawdust by "pressing down" on it like a spring. It was annoying and I decided to shorten the flex to a length that actually "lifted" the top off the drum to make changing easier. An unexpected benefit was that the shavings stopped clogging the cyclone (I was in the middle of a lot of jointing with EWP). It seems that the twist on the flex functions like a screw to work the shavings down into the drum ... stretching it made the thread more aggressive, and moved the shavings down faster. Would never have guessed.