My machine was running badly and it was loud. This was well deserved punishment for me, because I didn’t take it for its usual spa service last May.
When the stitch quality started to deteriorate, I decided it was time to, at least, clean it out. I took off the sole plate and the bobbin case and cleaned out any lint I could find and reach. It was actually quite a lot, I am ashamed to say.
I am planning to take it in. I have to make an appointment. I’ll do the two machines in tandem with my 6600 going while I am on a short trip DH has to take.
Lesson: clean out your machine even if you can’t get it serviced.