Tara
I know the Freesia fairly well and I would suggest that you check the top tension dial and run a piece of paper money through there. I think you might have something caught in the tension disc or lint is building up in there. Also if you are sewing along and get really fast at your speed and then slam on the brakes by taking your foot off of the foot pedal the thread continues to unwind and may be coming out of the take up lever. Just some suggestions. If this doesn't work try another spool of thread it may be that one particular spool is causing the problem. I have seen some really strange things.