I was doing a t-shirt quilt with really heavy seams and broke a needle. Replaced the needle -- everything seemed okay. Finished the t-shirt quilt, loading another regular type quilt and while stitching the top to the back and batting, the new needle broke. I thought maybe I just didn't tighten it good (even though I made a point to when putting it in).
Well, when I started to take out the bobbin case, the lever that usually goes left-right and opens out from the right is pointing up and down with the lever opening from the top. I've used this machine since 2004, have broken a few needles and