I currentl;y have a Mathews Switchback I got in March probably had 1000 to 1500 shots through it. shhooting at 70 lbs thru WB

My lower cable is starting to fray badly to the point where I am buying a new one. Also thinking about buying a new String as well.
I hope this is all pretty normal where and tear. Love to know if I am wrong. Secondly my upper string supppessor is has a grove worn in it, right of the center of the where the string would rest. I had not noticed it until I took the boiw in to have the cable replaced.

What kind of problem do I have with my bow?

THANKS