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Are your feed dogs down? If not check your stitch length or possibly it is set to tack stitch. What material are you trying to sew? If it is lightweight like tulle you will have to set your feed dogs. Check your manual on how to do this.
Sounds like your machine is off timing, When the machine is properly timed, you should see the hook passing behind the eye of the needle when the needle is on it's upward stroke. If this is not correct the machine will not pick up the bobbin thread. You may have to take it in for adjusting, unless your a bit machnical.
Try going to your Bernina dealer and see if they have any suggestions because they can evaluate if it is serious or just a simple adjustment. You have a great brand and you do not need to have it messed up by not having someone try to fix it when they do not have the right tools or know how. It may be due for a simple tuneup.
Try to make two parallel lines of straight sewing on a big stitch, then pull both ends together. this gives the best gather. Tighening the tension to make the thread pull doesn't work as well, although its OK