The very first step is to stoop and take a deep breath. Looking at the issue with a calm clear mind is going to make the troubleshooting process much easier.
Is the machine acting erratically? Are the problems the sewing machine is having inconsistent? Is your thread shredding and unraveling? Before you blame the sewing machine, try a different thread. Thread is the main tool that the sewing machine uses. Many people do not give the quality of the sewing machine thread a second thought. You don't have to believe this article but it seeing is believing.
One of the most common sewing machine problems is the sewing machine deciding to have a loopy knotted mess of thread, which stops the machine from sewing and leaves a knotted mess of loopy thread that is miserable to rip out. Believe it or not, the solution is very simple. Grab the seam ripper, calmly remove the faulty stitches and solve this common problem
The sewing machine is skipping stitches, it may happen constantly or it may be occasional but the stitching is inconsistant. Again this frustrating problem usually has a simple solution, once you let go of the frustration.
Does it seem like you are changing the sewing machine needle almost constantly? Is the needle hitting other parts of the machine and making noise? Do you know what the sewing machine feed dog is? If you are fighting the feed dogs and not allowing the feed dog to do their job or try to do the job of the feed dog, you are going to bend and break sewing machine needles.
6. Clunking, Grinding, Banging Noises
Is your sewing machine making noises that caught your attention? Whatever you do, stop sewing! Those noises are a signal that something is jammed or rubbing. How long has it been since you cleaned and oiled your machine? Even if the machine had been sewing along just fine, a tiny bit more lint or a single thread can be the "thread" that "breaks the camels back".
The manual for your sewing machine is the best source for how to do regular cleanings and routine maintenance. Many machines can not be "oiled" the way older machines were. Read your sewing machine manual to prevent damage that could lead to costly repairs that could have been avoided.