mysher

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I have a Babylock Tiara. I bought it used from a dealer. Since I've had it, I have always had to constantly adjust the tension, even throughout the project. It's like Goldilocks. Not only do I have to fiddle with the tension, I will quite often get these huge loops of top thread in the back. You can hear this take place when it happens. So then I'm ripping stitches. Look at the bobbin area when this happens. There's a wad of thread (look at the 2 o'clock position in the photo) and notice the top thread is now behind the bobbin release lever. What is causing this and what can I do to fix it? Any and all suggestions are welcomed with open arms!