A condition in which communication lines or networks fail to operate properly—causing calls or data transfer to be slow, dropped, or unavailable (communication/network outage).
大雨の影響で通信障害が発生し、携帯電話がつながりにくくなった。
Due to heavy rain a communication outage occurred and mobile phones became hard to connect.
午前中、社内システムで通信障害が起きて業務に支障が出た。
In the morning a network outage occurred in the company's systems and operations were affected.
通信障害の原因はルーターの故障だったと判明した。
It turned out the cause of the communication outage was a router failure.