I've been having similar problem and I blame it on the thread--but it is thread I want on my quilt. So I drag the tip of "all purpose SEWER'S AID" several times down the spool. It seems to help the thread glide thru the needle eye. I also use mineral oil in a small bottle with tip--like eye drops come in. Neither are harmful to the quilt or machine as it disperses/soaks into the spool and minimal amt goes into the stitching. And I wash my quilts after finishing anyway to remove marking. I always let it sit for a few minutes before beginning, and this has been working for me. I've noticed this happens with a certain brand of cotton threads that are varigated. Otherwise, I love the threads. I hope it might work for you.