After Citizenship - always stopped at airport entering country

[jcdc]

My husband became a naturalized citizen a few months ago and
applied for and received a US Passport. He recently traveled out of
the country for a few days
and upon his return with his US Passport, he was detained at
Immigration at JFK airport in NY. His passport is apparently
"flagged" due to a traffic violation from 10 years ago.
The immigration agent let him go but said he will encounter this
problem every time he re-enters the US. Since My husband travels constantly for business, He spoke to an attorney who said that he could clear up this problem by filing a few forms. My question is:
What can we do , is there a form we can file to prevent this inconvenience in the future? or is this a case in wich we need to hire an attorney?

Can you advise please

Thank you

 

[Born_American]

Could you elaborate on the nature of the traffic violation and how it was resolved and whether it was documented in the N-400 application.

Thanks!