Re thread top & bottom, then check your top tension. if not the problem try changing the bobbin tension.
What kind of thread are you using. change to see if that helps

i had a problem close to that my bobbin thread kept breaking finaly took everything apart found out my bobbin was wound to tight and was not feeding

Those loops are on the bottom of the fabric, your top tension is too loose. Re thread the machine making sure you have got the thread properly seated on the tension discs. If your discs are hidden inside the machine expose them and take a piece of folded muslin and run them through the discs. Sometimes the smallest amount of lint or thread will throw the discs out so that the tension is not properly regulated. Check to see if the needle is inserted the correct way and that you are threading it from the proper direction. IF and only if none of these work try loosening the bottom tension. Good luck, and let us know how it works out. :D

Use the same weight thread in both bobbin and top thread. Just another thought, old thread sometimes frays, and poor quality thread often has a roughness to it that causes problems. :-)

Make sure your needle is in the correct way.

Have you changed your needle? Mine was doing the same thing and I did everything that I knew to do and it still did it, so I got my manuel out and it was my needle, I had the wrong size needle in my machine, never knew that it took a special needle, so check your needle size, maybe thats it. Who would ever think about a special size needle. LOL Hope you get it fixed. Have a great day.

first and foremost--> CHANGE THE NEEDLE!! My machine man tells me this will solve 80% of the problems.

Also a good machine cleaning, new thread and new bobbin. Try everything, sometimes lint gets caught and causes problems. I use an artists paint brush to clean inside the bobbin area and wherever I can reach with the brush. Surprised how much lint get built up in that little area. Good luck.

Sometimes I use a mesh thread holder over the spool and that really helps with curly thread. Also to use the thread on a stand I have been known to use a heavy metal washer on top of spool. those are two things I have had to do to use the thread when it was just to curly. I think it got wound so tight that it just couldn't relax, but with a little tension on the thread it comes off straight.

Good Luck

Suzy

Be sure your bobbin thread is threaded from the bobbin correctly. Some self winding bobbins thread right to left and some left to right. Most bobbin cases need to have the bobbin unwinding counterclock wise inside the case. I about went nuts trying to figure out why my bobbin thread was looking like a solid piece of thread after sewing. My bobbin was in the bobbin case unwinding in the wrong direction and kept slipping out of the thread slot in the case.