SOURCE: it jams up
When that happened to me I had to replace the bobbin case-- (the peice of the machine the bobbin goes in.) It wasn't a Brother, though. I'd take it back to the repair shop and tell them it's still doing it.
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the bobbin holder aligns itself incorrectly constantly on mine, you HAVE to use their bobbins too as well as their needles, I cant find replacement needles anywhere!
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