In my biz, 90% of the time the issue is a cable/connector.
Many times cables will go bad within 3 inches of the connector.
This is usually because thats usually where the stress occurs because it’s usually bent there from cable weight OR the cable moves a lot when connected.
Fractures in the wire can build up to a break.
Vocal mic cable go first.
Usb connection can wear out. Again weight of the cable or movement start wearing in the female connection metals.
We don’t buy any molded cable. Because it gets used and wrapped up nightly we know we’ll have to chop the last 6” off and reinstall the connector.
An install where the stress of the cables is held up and fixed to a case wall…..last a long time.