Meaning
A systemic quality failure affecting more than a specified percentage of shipped units is categorized as a high-incidence field event. When a design flaw or component batch issue triggers widespread failures in the field, the industry classifies the occurrence as an epidemic defect. Rapid containment actions are necessary to protect the deployment.
Root Cause
Variations in supplier materials or uncontrolled adjustments to the manufacturing process usually generate these widespread failures. An epidemic defect often emerges from a subtle change in a silicon wafer batch or a sub-tier component revision that passed standard incoming inspection. Because the vulnerability remains dormant during factory testing, it only becomes apparent after several months of field operation.
Environmental stressors like elevated moisture levels or temperature cycling accelerate the onset of the mechanical or electrical failure.
Response Protocol
Corrective action begins with isolating the affected date codes and halting shipments of the suspect inventory. Engineering teams run accelerated lifetime tests to replicate the failure and confirm the boundary of the affected population. The verified solution is then applied to future production runs.
Financial Liability
Contractual clauses determine the division of costs for recall and rework of units affected by an epidemic defect. The manufacturing partner typically absorbs the repair expenses if the issue is traced to workmanship. Supplier responsibility is established through metallurgical analysis or board-level diagnostic testing.
