Understand that except for very high-end specialized network analyzer cables, the flexible cables we buy have to be considered consumables, as their attachment points and wires will sooner or later begin to degrade from bending and twisting and will need to be replaced. I just buy cheap ones and toss them when they start getting noisy, or just break, as they all do, eventually.
Pro tip: When they do fail, cut off the ends before discarding them; if you don't somebody will inevitably fish it out and try to use it. "Hey, look at this nice cable someone threw away. .."
73, Don N2VGU
Donald S Brant Jr