Holy Batman! This also just happend to my XC60 this Friday morning. Same situation. Looks like water came into the plastic cylinder inside, and froze up over night. Friday morning when opening the tailgate, a nasty crack sounded, and the cover snapped.
I'm no engineer, but I dont really think that water is supposed to go inside the cylinders. For a car developed in Sweden, where temperatures are prone to go below zero often during this season, this would be a huge problem.
Mine is going to dealer this Wednesday. Initial thoughs from them, was to replace the entire strut. Maybe a seal at the top is missing or the like.
Will keep you posted.
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