Time to check the pattern.
Punch card - Check the punch card to make sure that the
card itself is not damaged. Make sure to check the sides of
the card and the actual pattern. Look for larger holes or
rips in the card.
Mylar sheet - Check the sheet for foreign substances.
Such as oil from potato chips, cooking, machine lubricants.
Look for larger holes where it feeds into the card reader. If
you made the pattern yourself, did the ink smear or
smudge.
Built-in - turn off the machine and consult the manual for
checking your built-in patterns. You can call us for
assistance.
Make sure your yarn is able to move freely as it comes into
the yarn tension unit.
Try a different cone of yarn because cone yarn can have
uneven spots in it.
Check the sinker plate wheels and brushes to make sure
they are moving freely.