No, it isn't dirty feed dogs, I was wishing it was something so simple. I have a Brother NX600, guess it needs a hospital visit. Can the 1/4 inch foot wear out. Just tried a reg. foot & no problem.

I am always surprised just how much lint gets packed down in the feed dogs, do not like cleaning out that area of my machine, but it does sew better when I do.

Are your seams nested or are you sewing through layers of fabric?

Yes my seams are nesting.took my machine apart to double ckeck the feed dogs to make sure they were clean & they were. Was putting the stitch plate back on & dropped a screw down inside my machine. Have to wait for DH to come home & take it apart to get that screw out of there. I know better than to mess with screws as my arthritic hands will not co-operate. That's me done for today.

perhaps he can use a long grabber to get the screw out. Hope so. using the 1/4 inch foot might be part of the problem going over thicker seams. I use my walking foot but have a Janome MC4800. good luck.

Yeah, DH just got home. He just turned my machine upside down(cringe) & shook till the screw fill out Since my spool of thread was almost empty I grabbed my serger cone & tried sewing. It is now back to normal. Was the thread the whole time. No more tiny stitches & sews over seams the way it should.

I agree with Tartan and JulieR. Lint build up is a real problem with the newer machines.

Check your manual.

Sometimes I call my machine maintenance person for help and she tells me what to do. Other times I just ask when in the LQS's that carry my brand of machine and they will give me suggestions.

When this happens to me, I know I need to lessen the pressure on the presser foot. There is a knob or dial on top of your machine with numbers. The lower the no. the less pressure.