Ive seen them on a bunch of them often one side comes loose, from the way they loosen up i would think its more of a technical know how mixed with age.
First seen in 2003 catalogue.
Same happens with Colnago and similar bonded frames. Saw a guy in Vancouver with an Alan Carbonio wreck it, pulled away at a stop light and his chainstays popped off.
The failures are probably brought on by salt. Coastal air can wreak havoc on carbon/ally gear