Curtain broken 2nd time in 6 months

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Hi

I have a 645DF+IQ250 system

my curtain in the camera was broken last June and was sent for repair ,
6 months later December and it is broken again ,

my dealer first said they changed the lab so they don't take it under their warranty to repair it with no charge
and then they did take it under their warranty buy I had to pay for the costs of shipping and taxes ( about 1/4 of the price)

I am now facing with a body who has had a second curtain change and don't feel I can be sure it won't happen again so soon

can any one say if they heard of a similar situation ? and what would you do?

it has become a huge expanse of money