It simply will not hold its tension.
One good seam, and the next one has the bottom thread all tangled and loose.
I clean out the lint regularly, oil the bobbin case etc.
Then it behaves a bit, and then after a while, it goes to pot again.
any suggestions?
I'm limited in what I can buy for a machine as I live in very rural Vermont; it already takes an hour and a half to drive to the nearest shop.
Martha