Thank all of you for your help.
Have tried everything mentioned.
4 different threads. Several different feet. New needle plate. New Bobin. New Bobin case. Even traded by bobin rounder with one at the dealer. As long as there is fabric for the needle to sew through the thread will not break. Only brakes when there is no fabric for the needle to sew through.
I have been sewing for over 50 years and I have really learned to HATE this machine.
Bernina has been no help at all. Keeps sending me to the dealer I bought the machine from and they tell me to SEW SLOWER which means that the thread brakes every 8 or 9th piecing instead of 5 to 6 piecings.
I have had it serviced 6 times in 2 years. They all say that everything is fine.