Hi, I have just bought a used Garter carraige. It knits fine , but it emits a buzzing type noise (possibly a stripped gear) every few stitches and after about 40 rows it stopped mid row. I pressed the button to get it going again and after a few attemps it starts to knit again, now it will only knit a short row or two before stopping again. Any advice on how to remedy this please. Thanks Peter