dead-zone unit
Computing term for a unit or element that is in a dead zone, i.e., not responding or inactive. Rare outside technical contexts.
In this system, when a dead-zone unit is detected, it is automatically restarted.
不感帯 (dead zone) is the broader concept; 不感帯要素 refers specifically to a unit or element within that zone.
Compound of 不感帯 (dead zone) + 要素 (element, unit). The exact derivation is uncertain; likely a technical coinage in computing.