Originally Posted by patdesign

If your machine has auto tension controls it is a little harder to correct tension problems, but try making sure there are no pieces of thread stuck in the top tension discs, since that will hold the discs further apart which would tend to make the top tension too loose. I have a Brother Embroidery machine that does this and after a shop visit when the repairman showed me what the problem was, I just take mine apart and clean out the discs, and the problem disappears. The good news was that the dealer serviced it for free since the machine was only 6 months old the first time it happened. :D