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What you are seeing is called "bird's nesting." There are two main reasons for "bird's nesting."
The first one is the thread not between the tension disks. That allows the thread to be pulled from the spool instead of pulling the thread tight from underneath. Always make sure to always put up your presser foot before you thread the tension disks. I also check the thread after I finish to make sure the top thread has good tension on it before sewing.
The second reason is the thread is not being pulled by the take up lever. Make sure you see it being pulled by the take up lever before you start sewing. If not, rethread it.
bunching underneath is an indication that the top tension is incorrect
switching projects and materials also that attention has to be given to tension adjustment both bottom and top
the catching sometimes indicates that a tension is too tight and is pulling the needle out of line
It may need a cleaning and lubrication to resolve the noise and stiffness.
as to the thread bunching on the bottom, try re-threading both the top thread and the bottom thread, if it persists, try a different bobbin, (the one your using may not be wound properly, it happens) If it still persists try a new needle. if all of this fails, take the machine to a reputable service facility, it usually helps to take a sample stitching to show them exactly what it's doing to you,
try changing the needle rethread the machine top and bobbin make sure the bobbin is inserted correctly into the bobbin case and that the bobbin is turned the right way make sure the thread has not come off the thread take up lever if the machine continues to see bunch thread underneath then the machine may need to be checked to see if some part has become damaged or out of alignment
According to everything I've researched, when this happens it's because there is no tension. Check & make sure it's threaded properly. If it's still bunching underneath, then there may be something wrong inside the machine - even though you adjust the tension, it may not really be happening inside. You'll have to take it apart or service it.