I am taking a class and am bringing my Bernina QE153 to use. I started with a new spool of thread and freshly wound bobbin. I admit I didn't try them at home before I left, but I have traveled this machine before and no problems.
This time I got all loopy bobbin threads. So iI turned the machine off and on and tried again. No. Then I used a different thread and bobbin and it worked fine. Went to do some blocks today and same thing, with the same thread spool and bobbin that had worked fine at the class.
This time I took the bobbin out, reseated it , moved the spool to a spool stand, wound a new bobbin(I had grabbed a prewound for quickness) and turned the machine off and on. Then it was fine.
Berninas aren't supposed to be this fussy are they? Should I travel it without the bobbin in place? Or does it sound like it needs a tune up. It's been a couple of years, but I haven't sewed all that much and I try to keep it de-linted, and I think it sounds ok? Any suggestions?