Your client is a branch, not a bank
Valuation practices describe their clients as banks, but the work does not come from a bank. It comes from a specific branch, and usually from one or two credit officers inside it who have your number saved. When that officer transfers, the flow of requests can stop even though the empanelment with the institution is untouched.
Treating each branch as an account with its own request volume, its own contacts and its own history makes that visible. A branch that sent six jobs a month and now sends one is an early signal, and an early signal is something a partner can act on with a visit rather than a post-mortem.