Tajima shaking alot

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Hello, 

Hopefully someone can help me on here. I have a Tajima TMAR-K 1508C.

Recently I been seeing that the machine shakes a lot when its stitching at certain angles and causes the needle to break at times. Does anyone know why this could be happening? It doesn't shake as much when I change to the hat attachment and run hats. 

 

Thanks!