Heavier cables can often benefit from right-angle plugs at the keyboard ends, putting far less torque on the jack. I have ALL my cables (audio and footswitches and pedals) set up this way, and never get stress related problems on the jacks.

Corrosion and dirt, that's another matter...

A case for your keyboard, vinyl covers when resting, wrap and store cables when not in use, regular cleaning of snake breakout boxes, all of these things will ensure years of trouble-free operation.