Watea durability issue

Just had two friends who have had the small fishtail "module" fall off their Wateas. On one of the skis the whole piece fell off, making the ski 4-5 cm shorter and non-twintipped. The other friend´s ski got a crack in the middle of the fishtail and later on half the tail disappeared. Both skis were quite new and had been used around ten days only and none of the skis had been taking any sort of abuse that could justify the damage. Anyone heard of this problem, or is it just my friends who both are unlucky enough to get bad pairs?