Answer: Spontaneous recovery
Step-by-step explanation:
The spontaneous recovery is one of the type of concept which is related to the memory, conditioning and the learning process and it is first explained by the Ivan Pavlov.
The spontaneous recovery is refers as the returning of the terminated behavior and this basically re-occurrence of the CR (conditioned response).
According to the given question, the come back of the unwanted or the unexpected behavior which occur occasionally and this process is known as the spontaneous recovery. Therefore, Spontaneous recovery is the correct answer.