Can I reuse my problem statement?
Typically, Turnitin is set to find similarities that are 3-4 words long at a minimum. So, is there a way to make minor edits so that your statement is slightly different each time? You can also ask your professor if it's okay to reuse your problem statements. Then, even if Turnitin flags it, your professor will know that they are still your words and ideas, since you discussed it ahead of time.