If you have tried everything else (new needle, checked to see that you have the correct needle for the machine, rethreaded the machine top and bottom, etc) this is a tip I have often seen … think of a clock on your base under your needle
So if you are having a problem with skipped stitches, try turning your needle ever so slightly from the 6:00 o’ clock position to 6:30.
If you are having a problem with shredded or breaking thread, try turning the needle to 5:30