I’ll tell you how my string broke.
In my room, my 30 string Celtic harp sat in fine temperature. Then, I moved it outside where it was the temperature was cooler. But as I played, I noticed the #29 B string suddenly came out of tune. As I tuned it upward with my tuning pin, it broke. This was my newest string from two months ago and it was the only string to go out of tune.
Has this happened to anyone?