Sorry about the confusion. It is the 100 wt polyester thread in the needle that is fraying and breaking. There is no damage to the fabric itself.
I did floss the thread run and clean and oil the machine.
Since I had already used the combination of 100 wt polyester in the needle and 50 wt cotton in the bobbin to quilt plain cotton with no problem,I was wondering whether it could be the metallic element in the fabric that is fraying the needle thread. The 100 wt polyester thread is very, very fine.
By the way, thanks to all of your for taking the time to reply.