Jamasue

Hello, I'm new to this group - hope I'm doing this right...
I am struggling with top thread breaking and shredding while I'm free motion quilting. I have a Janome 1600P (mid-arm) on a quilt easy frame. Superior 50 wt on top & bottom, tried many different needles, threads, rethreading, etc. Machine is newly serviced.

She sews fine on a sandwich pulled through the machine by hand (not on the frame). When I try to quilt a quilt on the frame, I literally sew about 6 inches before the thread starts skipping stitches and eventually shreds and breaks. I called the tech that serviced her, he didn't have any ideas. Fast or slow, doesn't make a difference.

I've had this set-up for about 8 years and it has always been a struggle to find the right combination. I'm at the end of my rope!