I've had several masts come down for all sorts of reasons. Mostly due to failed shrouds, however we had a mast tang rip out on a 2006 Gway and also had a bow tang break open right at the fold. We also had the top end of a roller furler break, bringing down the mast yet again, which Ronstan was kind enough to warranty - again 2006 boat.
We never leave sails up when not in use and drop the masts in the off season.
We are doing everything we can to keep these masts up including new rigging from Hobie every 2 years and replacing all hardware from the 7 hole adjuster to the tangs.
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Capt. Han
Sail Safaris tours, lessons and rentals
St John, US Virgin Islands
http://www.sailsafaris.nettoll free(866)820-6906