OK, I've hooped (using the hoop size called for in the design I purchased) my minky, complete with polymesh underneath and WSS above, threaded both needle and bobbin of my Bernina 635, started sewing the design ... but I keep getting a "!" message on the screen after the first ~85 stitches. The manual says that "!" means the user is supposed to do something ... but it doesn't tell you what and I haven't a clue. I've pressed OK just to find out what would happen, and it starts sewing the design over again from the beginning, stopping in exactly the same place and giving me exactly the same message. Any suggestions?