Publius Enigma writes…
”I still maintain that the customer didn’t necessarily know that the fault had resolved itself, rather than a technician fixing it.”

I doubt very much that the fault “resolved itself”, I have yet to see a pair of copper wires grab a pair of pliers and a bag of scotchlocks and remake a bad termination. …
– Whirlpool User PacketStorm, in a discussion about “No Fault Found”.