Stihl ms 661 trouble

[SJK]

Hey Guys.
Anyone Who knows why stihl has called back the new MS 661?
I´ve spoken to a woodsman here in denmark, he wanted to sell his MS 660W,
because he wanted the new 661. and he got he´s two 660 sold, but when he wanted the 661, they were called back  :-[ And he´s living of it, so thats not so good. But Stihl lended him two brand new 660, until they got the 661 back to sell Again, That´s service