I have a fairly new. I have a fairly new Bernina 440 sewing computer machine with embroidery

Question

I have a fairly new Bernina 440 sewing computer machine with embroidery module. While working on an embroidery project, I had a thread break. Fixed it and rethreaded the machine. Now the machine will complete 45 stitches and then I hear the "broken thread" alarm again and it stops. There's no thread break, though. Does this every 45 stitches. I called the dealer and she said to check a spring on the take-up arm. I did that, but it didn't help. Any ideas? Thanks,Diane