Needle keeps breaking when quilting

The machine needs to be taken to a sewing machine shop & be
checked to see if it has jumped time,, a sewing machine shop
technican has the tools to retime the machine & the foot needs
to be filed to get rid of the burr on it.

Check that the needle is coming down in the centre of the needle plate hole - both side-to-side and front-to-back. If it is, take out the bobbin, carefully move the needle fully to the right by gently just pushing on the needle bar. Rotate the handwheel towards you until the needle goes down through the needle plate and just starts to come up. Stop there. Tip the machine back slightly and open the hook retainer (the black plastic part that holds the hook in - unlatched on the left-hand-side), but DONT take the hook out. Continue to rotate the handwheel slowly towards you and you will see the point of the hook (shuttle) rotate clockwise and disappear behind the needle. Stop before the point emerges from the right-hand-side of the needle and check that the point of the hook is just above the thread hole in the needle. If it is a long way above or below, the timing is out and needs adjusting by a Bernina agent. If the needle is hitting the hook, this is also another adjustment that needs to be made by a decent Bernina agent.Another, much simpler reason for needles to get broken is if you pull/push the material through the machine. If using the feed-dogs, dont ever pull/push the material ... just guide it and let the machine do the work; if doing free-hand embroidery with the dogs down, be gentle and dont go at it like a maniac !!!