I had 11 strings break in the first 8 months on a lever harp shipped from California to Wyoming. One of those was on stage just before a performance but the rest were sitting around my house. Then it settled down for a year and just broke 2 strings in the last month as the weather as been changing (much rain and heavy wet snow).
My pedal harp rarely breaks strings, and only once (a 2nd octave B) during a performance on a hot July day. I didn’t need that string and ignored the problem for the rest of that piece. Interestingly the pastor standing on the opposite side of the altar was quite unaware anything had happened while I quietly changed the string during the service.