Sentence examples for part of the problem from inspiring English sources

The phrase "part of the problem" is correct and can be used in written English.
It is typically used to refer to someone or something that contributes to a larger issue or difficulty. Example: "The lack of communication within the team was a major part of the problem that led to their failure." In this sentence, "part of the problem" refers to the team's communication issues being one aspect of the larger issue that caused their failure.