Macbook Pro Charger cord breaking/short despite my following the care process?

Despite my following the care process this is my 2nd 85 Watt Magsafe adapter to go bad and has a short in the cord after the adapter. I ensured I kept the cord uncluttered / not tangled up in open area / wrap accordingly (manual on how to care for magesafe adapter) when not in use. At work I keep the adapter on the desk. I have had my computer for 3 years without issue with the exception of having to purchase an $80.00 adapter cord a year ago. Now I have to purchase another within a year & half time. This isn't right.

Can some one provide insight on how to address this (replace without having to pay for another cord).

I bought it from best buy. I will try and locate my reciept.