all of a sudden

"I was enjoying flying with the birds, then all of a sudden I experienced the most violent air I've ever been in," he said.

"I think it's very cruel that mummy has this service to fall back on, every day for 16 years, and then all of a sudden it's just not there anymore."

Then all of a sudden one team swaps to a 3-4-2-1.

"Sometimes there is constructive cooperation, and then, all of a sudden, some kind of crisis appears."

If shoppers return to pandemic-era stockpiling, then all of a sudden everyone is going to run to the store to grab the same thing, creating shortages.