The phrase "unexpected surge" means a sudden and unexpected increase or rise in something.
Sentences with «unexpected surge»
Use this knowledge to staff accordingly or implement technology that can handle unexpected surges in demand, making sure you are covered when the phones begin to ring off the hook. (entrepreneur.com)
«But grid operators routinely curtail wind turbines to avoid a sudden, unexpected surge of excess electricity that could overload transmission lines and cause blackouts. (sciencedaily.com)
BCH was added to the platform only to have books temporarily closed on trading due to a sudden and unexpected surge in pricing. (zdnet.com)