Sounds like what you have is called bird nesting or thread nesting where the upper thread is creating loops and globs of thread under the fabric. Usually, it is caused by incorrect threading or the thread not being seated properly in the tension disk.
Make sure there is no accumulation of lint, dust, or broken thread under the feed dogs, needle plate, or bobbin area
Install a brand new needle.
Remove the upper thread completely. Always RAISE the presser foot and then thread from the beginning (confirm with the owner's manual that you are following the correct thread pathway).
Set the upper tension around the midway point between high & low numbers.
Retest.
FYI--thread problems appearing below the fabric are usually upper thread related. Problems above the fabric are usually bobbin related.
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