buzzing gut string

just got back into playing after 25 years not touching it. Bought a new bass and put a Lenzner gut G-string on it, 3 months later and the bass has a buzz when I play on the g string from a-d. put a steel string back on abd the buzz went away.

anyone have similar experience with gut strings? I ordered a new Lenzner to try just in case I had a bad string but it would be a real bunner if I go through gut strings every 3 months. I admit I play hard, I have been trying to play without an amp whenever possible.

 

thanks! I'm an FNG