_________ prevents or inhibits the normal use or management of communications facilities.

The term you are looking for is likely "Interference."

Interference prevents or inhibits the normal use or management of communications facilities by introducing disruptions in the transmission or reception of signals. This can occur due to various factors, including physical obstructions, electromagnetic interference from other devices, environmental conditions, or intentional actions such as jamming. In telecommunications, interference can lead to reduced signal quality, data loss, and overall degradation of service, which can significantly affect communication systems and their efficiency. Effective management and mitigation strategies, such as signal filtering and enhanced transmission methods, are necessary to counteract the effects of interference and ensure reliable communication.