[Supplier] A key supplier misses commitments repeatedly but the business still depends on them. What do you do?

When dependence is high, I do not want to confuse frustration with strategy. I would quantify the failure pattern, make the business impact visible, and separate what needs immediate containment from what needs a longer-term response. That usually means a direct supplier performance conversation plus an internal plan for how much exposure we are willing to keep carrying.

If the supplier is still critical, then the answer may be staged rather than...