Possibly a change in construction. My old, 2011 60W 13" MBP charger is working like a change. My wife's 2014 85W 15" MBP charger is frayed at both ends. I've tr

Possibly a change in construction. My old, 2011 60W 13" MBP charger is working like a change. My wife's 2014 85W 15" MBP charger is frayed at both ends. I've tried to bandage it up with ResQ tape and even that is starting to breakdown. The feeling in the cords is quite different; while mine is quite flexible, hers feels really stiff. I believe whatever change that was made, possibly BPA-free, it has reduced the wearability of their cables.