It's a reasonable assumption that these belts are simply not strong enough either inherently so by design or by diminishing quality of manufacture.
Either way what cannot help is the stupidity of stop/start functionality. Pre 2014 XC60s would have tugged on their belts from rest once per trip (when starting the engine). The introduction of stop/start crappery meant the number of occasions of these induced stresses from 0rpm to 750rpm would be increased by several hundred percent every journey which can only serve to shorten the effective life of the item.
This is why I always turn off the stop/start immediately after starting the engine every single journey before I even put the car into drive.
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