I think anyone who has ever worked with a sewing machine has had problems with it at some time or another.
Like any kind of machine, sewing machines need regular maintenance to keep them running along smoothly.  Changing needles, cleaning the lint and oiling your machine will do a lot to keep it going for years.
But what happens when the thread starts breaking, or the fabric starts bunching up under the foot?
First of all, stop, un-thread the machine and completely re-thread it.  Lots of sewing issues can be solved by making sure the thread path is correct.
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