SOURCE: top thread breaking
Get a stuff called "Sewer's Aid". You can get it at Jo-ann in the notions department. It is a lubricant and I just recently used some to stitch rubber strips to nylon straps. The rubber is coated with an adhesive and without the Sewer's Aid, the thread would get gummed up on the adhesive, fray and break. I place the material under the foot, drop the needle and put just a drop where the needle goes into the fabric. It is very thick, like syrup and a little goes a long way. I have never used it on metallics but the way it helped me with the adhesive problem made me a believer.
SOURCE: singer futura XL400 thread breaking
Unthread the machine and start from scratch. After rethreading make sure your spool of thread has free play at the reel (not caught on anything) then check the thread tension make sure it's not too tight. Also check the bobbin is in place correctly and the bobbin has been wound correctly not too tight. If it is still happening it may be an adjustment to be done by a tech? Also try different threat, faulty thread can do that as well.
SOURCE: thread keeps breaking
Upper thread breaks
needle may be in backwards
Raise the needle bar to the highest point then loosen the clamp screw to remove the old needle, place the new needle in the clamp with the flat side to the back of the machine
Push the needle all the way up to the stop or as far as it will go, then tighten the needle clamp screw
upper tension may be to tight
the needle may be bent or damaged
thread may be hanging up in bobbin case--check area for loose threads or lint
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