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この問題は突然発生しました。
This problem occurred suddenly.
To occur, happen, or arise, often unexpectedly or naturally
天気予報によると、明日大雨が発生する可能性があります。
According to the weather forecast, there's a possibility of heavy rain occurring tomorrow.
Often used to describe events, problems, or phenomena that emerge or happen
発生する is often used to describe the onset of natural phenomena, problems, or events without implying direct human causation.
From '発生' (hasshō), meaning 'to occur' or 'to happen', derived from Chinese characters
Commonly used in formal and informal contexts to describe the occurrence of events or issues