Our last set of contacts for our Mits FA20 are averaging only 20 hours of run time before we start breaking wire due to the deep groove in the contact. Pretty sure we used to get 50 -60+ hours before rotating. Supposedly the same contact we have been using for years. What kind of run time is "average"? We happen to be running a production job,same program we have used multiple times, so that's not a variable. Same wire, same speed, same tension. Wondering if this is a wire issue or a contact issue? Haven't changed wire vendor or contact vendor. Machine get very regular maintenance, brass housings are in great shape.