Like Jim said, start with any unusual additives. You probably know this, but just in case; zinc is common on cable and can cause issues. You know zinc is present from a white/blue wispy flame coming off the cable. Fully galvanized would be more than obvious, the whole billet will "burn" with that white/blue smoke and it may even snow, so don't breath that stuff.
You might also take a section apart and inspect the core, sometimes there is a string of paper present that can cause issues.
I'd start with getting a different cable and see if that solves your problem. I just use plain old 20 mule team borax and do a lot of cable, lol.
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