First, check your sewing sample whether the loose stitches are actually the bobbin thread or the upper thread. Usually, loose stitches under the fabric indicate a problem with the upper thread.
The first thing to try is install a brand new needle.
Second, remove the upper thread. Always raise the presser foot and rethread the upper thread from the beginning--check to make sure the thread path is correct.
Set the tension to the midway point between high & low numbers.
Retest your machine. If upper thread is still showing under the fabric, the upper tension needs to be tightened. If the bobbin thread is showing on top of the fabric, the upper tension is too tight. When both threads meet in the middle of the fabric, the tension is correct.
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Try adjusting the top thead tension, alittle at a time on a scrap fabric and see if that helps
Read this hope it helps
http://www.threadsmagazine.com/item/4302/understanding-thread-tension/page/all
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