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I would say that the threading is wrong somewhere, watch your dvd and read the owners manual, also go to Singer.com FAQ for your machine, If the jamming is underneath, it is the top threading problem, on top, it is the bobbin thread either has lint or stray thread or thread not coming out the right direction for your bobbin, I am sure that it is just a simple solution, I also use metal SA 156 bobbins and have no problems,
Drop-in bobbin: Note: thread must change direction when entering bobbin shuttle notch. Usually bobbin will turn counter-clockwise when threaded properly.
1. hold bobbin so that the tail of thread is facing to left. 2. drop bobbin into bobbin shuttle. 3. pull thread toward you. 4. guide thread into notch and pull to left so that slot engages thread. 5. pull thread diagonally across shuttle toward back of machine. 6. draw bobbin thread up through needle plate with threaded needle.
Have you checked your needle (size, for thread your using, material) It sounds like a tension/settings issue, but could be as simple as poor thread quality. try changing the thread, and rewinding the bobbin. If using a silky material remember you need to back that up and make it stiff. If this and a resetting of tension doesnt work,
Check your left side right side balance (pg 57) Check page 84 on trouble shooting
You really should go on the Singer website and look up support and frequently asked questions. If, you cannot find your manual they have it there to download for free. I really think that you are not threading the machine right, check it with the presser foot up and the thread should feed freely, then lower the presser foot and it should not feed at all or very little. Most of the bunching of thread underneath is the fault of the top thread not the bobbin. Make sure you turn the handwheel towards you never away from you. Also, check your needle, inserted flat side away from you and, if it were me, I would use a new needle before I sewed again, This machine comes with a dvd, try watching it.