Times are tough for Chipotle Mexican Grill Inc. The Denver-based “fast casual” chain is dealing with the fallout of food-borne illness outbreaks traced to its restaurants, which have resulted in plummeting stock prices, lawsuits and a federal criminal investigation.

Now more problems have been cooking at Chipotle, but this time it’s the company’s treatment of people, not food, that is attracting negative attention. A case filed by three female former Chipotle managers in the U.S. District Court for the Southern District of Ohio claims that they were discriminated against by their male bosses on the basis of their gender.