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Hmmm, could be several things.
Try a brand new needle. Try a different brand of thread.
Remove the top thread from the machine. RAISE the presser foot and rethread from the beginning. Verify the thread path is correct.
If it still will not pick up the bobbin thread, the machine could be out of time.
Doesn't pick up bobbin thread
1. The bobbin may be in backwards.
2. The bobbin thread & top thread need to be pulled to the back before starting the stitching
3. You need a ballpoint rather than universal needle to sew on t-shirt knits.
4. the needle is in the machine backwards
5. Make sure the needle is the correct one for the fabric being sewed
6. Needle inserted wrong in the needle holder
7. Warped needle
8. Warped bobbin
9. Also could be a timing problem
If the thread is bunching up, it sounds to me like the stitch isn't being formed properly. Nothing to do with the bobbin, more a case of timing.
The spike, or whatever it is on your machine, which is under the needle, must pass through the loop in the thread from the needle at exactly the right time.
When the needle reaches it's lowest point, as it starts to go upwards again,a loop is formed in the thread,next to the needle eye. This loop is what the spike must pass through in order to make the stitch.