The cable fairy in the night knots them all up - same as speaker leads, guitar leads, mic leads, extension leads... Even if they are in a flight case which no one else touches. Here is the Paul Havell way of dealing with this; the cable fairy abhors half hitches - they are like a crucifix to vampires - so divide each length of lead or cable in half, then again as needed, tying a loose half hitch [the first part of a shoelace knot to you landlubbers] when the lead is of a pleasing size to your eye and hand. This will prevent any kinks in the cable and stop it mating with the others to produce a 'snakes wedding', as it is often called in ceilidh bands. Sorted !