matraina, try using your walking foot. It is a life saver for me.
The SQ9000 does not like to have the thread pulled out of the bobbin case. Example: lots of us sew to the end, lift the presser foot and pull the threads out to cut them. Doing this with the SQ9000 will almost always pull the bobbin thread out of the bobbin thread path. It will cause the top thread to break. It will tie the top thread and the bobbin thread in a knot and snap or bend the needle. Try using leaders and enders or keep sewing until the fabric is a couple inches away from the needle before you snip the threads.
I don't use my needle threader. The directions make no sense to me. There is nothing to punch the thread through the needle that I can see. I can thread by hand faster than I can fiddle with the threader.
There are lots and lots of post on the SQ9000 with tons of valuable information in them. When you get time you will enjoy reading them.
I hope you enjoy yours as much as I do mine.
Merry Christmas.