Can you look at the quality of charging cable being sent out with the Galaxy phones I have 4 charger cables in my house 2 of the charges have split cables. Both are less than a year old. 1 cable is less than 6 months and is showing signs of fault. Only 1 cable out of four is holding up however it is only 3 months old so far.
I've had the cable and power brick that came with my s7 edge for just over 5 months.
That said its permanently kept in a wallplug and into an official Samsung Desktop Charger so it's pretty much static where it is.