The human operator of a machine, a computer, or any device in general that is having "problems" or "errors" or "is malfunctioning" in the eyes of that operator. In this case, the problems, errors, and malfunction is actually a problem with the operator and not the machine, computer, or device.
Customer: What was the problem with my computer?
Tech: There is a problem with the carbon unit. It will eventually resolve itself after extended hours of use. At least that is the hope.