This is a little off topic, but I find when I'm getting to the end of a spool of thread and the tread seems to have become set in the shape of the spool. I don't know how to describe it. If you pulled a length of the thread off, it curls up is what I am trying to describe. I start having trouble with my machine, the thread seems to jump out of the hooks that hold it and I have to stop and rethread the machine frequently. I don't think I'm explaining this very well, but maybe someone will know what I mean. I have a Pfaff Hobby 4270 machine. It has been serviced recently. Any suggestions or help will be greatly appreciated.