There`s still more of a mystery to this. Not saying replacing the cable hasn`t cured the issue, but bare in mind that if it was something like carpet tacks etc then the fault must have been an open circuit inner core. If a carpet tack went through a cable then I suspect the PSU fuse would have blown. [Internal] It would be quite difficult to open circuit the braid without completely severing the cable, again blowing the fuse. Cable was probably pulled around some brickwork at some time. Just my tuppence worth.