When I try to bring up the bobbin thread, the top thread wraps around the hook assembly. This has happened before. I followed protocol- checked needle, rethreaded the machine, cleaned and oiled the hook assembly, etc. Twice. Called your tech support then planned to make the 2 1/2 hour drive to the nearest authorized tech. I then went back to the machine, went through the whole procedure again. And it worked. So I went back to quilting project and quilted for an hour or so. Anchored my line of stitching, broke thread to move to another area, went to bring up the bobbin thread and this whole scenario has started all over again. Cant bring up the bobbin thread, top thread wrapped all around the hook assembly. I have also had issues with the machine sometimes not bringing the needle up or down when I use the manual needle up -down button. I also have to let the machine "warm up" before the tension is correct. The tension will be perfect. I turn off the machine for the day. The next morning the tension is horrendous until I run several rows of practice stitching until the tension is good again. Does my machine have a gremlin? Help- I LOVE my Sweetie- when its working.