Look at the feed dogs to see if they are rising above the needle plate at least 1 mm. If not rising lint may have felted between the feed dogs and the needle plate. It could also be the feed dogs have been lowered, or the height has slipped. If the feed dogs are above the needle plate turn the hand wheel and see if they are moving from the front of the machine to the back. If not it is a length adjustment. If this is normal the pressure on the fabric may be too low. Another problem may be the timing of the feed dogs. The feed dogs should rise above the needle plate when the needle leaves the fabric and descend when the needle comes down into the fabric. This requires an expert to fix.
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