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のもとになる

become the cause of; lead to

→ の
phrase Rare #39,292
become the cause of; lead to Often used to describe something that causes or leads to a problem or outcome. The form のもとになった means “became the cause of.”
JA: スピードの出し過ぎはしばしば自動車事故のもとになる。
EN: Excessive speeding often leads to car accidents.

面倒のもとになるだけだ

It'll only cause trouble.

— ラストエンペラー (1987)

スピードの出し過ぎはしばしば自動車事故のもとになる。

Speeding is often the cause of car accidents.

人種問題はしばしば社会不安のもとになる。

Racial issues are often a source of social unrest.