Sewing machine thread nesting

not sure if this will help you...Check Your Tension Settings. Looping underneath the fabric usually occurs when there is not enough tension in the needle thread to pull the bobbin thread. Sometimesthread buching can be caused by something as simple as the tension dial being inadvertently turned.

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or you could go to this link and see if it helps you out.. thread keeps looping Google Search

indicates bird nesting which is from the needle thread tension being too loose

Sounds like thread nesting (or bird nesting).

Remove the top thread from the machine.
ALWAYS RAISE the presser foot and rethread from the beginning. Verify the thread path is correct,.
Set the upper thread tension to the midway point and then tweak it for your machine.

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I am not sure as to your machine, are you saying a "brother" machine? If your tension is set, say on 6 and it is too tight, turn the dial one more number......to a 7 or to a five and then check again. Also, I would rethread the machine and also take the bobbin out and then put it back into the machine. A lot of times, the bobbin isn't threaded into the machine correctly and it bunches up. Also, you can't use certain thick thread on some machines.

increase the needle thread tension
the term is bird nesting and is caused because the needle thread is not pulling the bobbin thread up

Susan--
Easy peasy, once you know the problem and how to fix it. It's called "bird nesting" or "thread nesting" or what I refer to as thread "barfs."

Install a brand new needle.
Remove all the thread from the machine.
**ALWAYS RAISE** the presser foot and rethread the top thread.
Verify the top thread path is correct.
Install and thread the bobbin case, make sure it is correct.
Set the top tension to the midway point.

Now retest your machine. Birds nests gone? You may need to tweak the top tension because the factory standard changes due to age and use.

FWIW, problems appearing under the fabric are an issue of the top thread. Thread problems appearing on top of the fabric is a bobbin issue.

What causes Bird Nests Superior Threads

Birds nest under the fabric big loops of thread top side looks good...

WHY IS THREAD BUNCHING UNDERNEATH MY FABRIC

sounds like what's called bird nesting
try these links for help


sewing machine birdnesting

Sewing Machine bird nesting Problems


Sewing Machine Thread Bunching Up Here Why

Sewing Machine Troubles tension bobbin nesting

What you are experiencing is called thread nesting or bird nesting.
Perhaps this will help:

Have Singer 11910000A and the bobber thread bunches up and makes mess in...

It is your top threading, totally rethread, then with presser foot up, pull on top thread, it should feed smoothly, now put the presser foot down, pull thread, it should barely move. This should seat the thread in the tension discs.

Mono thread can develop a memory and curl itself around things. I hate the stuff.