14 broken strings in a month

[burgess macneal]

I have a Kimball church piano with a "normal" string breakage history
for hard playing... maybe one bass string every year or two.

All of a sudden, in one month, they've broken 12 treble strings (6 pairs
- 4 of them contiguous) and 2 at the highest note in tenor/treble break
(C-5).  Same pianist as always.

Breaks seemed to occur at plate bridge.  Bridge seemed smooth,
unmarred.  Strings not rusty.

Any ideas on what's happening?

Carolyn Macneal
Associate - Roanoke PTG Chapter