I purchase my Sapphire 875 Quilt supposedly brand new. It jams with bird nest thread all the time. I thread it correctly, new needle for right fabric type, and re thread the upper thread correctly, (red-do this all the time). The machine machine starts to jam then stops and says Main motor overload" Please wait, and the knob cant be turned during this time. When the message goes, i might be able to sew more. Then there are random times I can sew with no problems for a few hours. The machine has been cleaned, there is nothing stuck under the bobbin etc. This machine cost $1000 and I can't even use it.

I was ecstatic to get my new machine 875 But I have had nothing but frustration the auto threat won't thread, bottom thread keeps looping & breaking .
I have changed the needle adjusted the tension changed the thread, cleaned under the foot, Does anyone have any suggestions ? I have taken it back to the dealer a couple of times, he tells me there is nothing wrong & suggests I buy all new threads !!
PS I am 62 & have been sewing since I was 10 yrs old .

a very fickle machine