Freezing a credit report is an effective way to prevent mortgage fraud and identity theft, but mortgage lenders and brokers may also be losing potential customers because of it. Industry groups need to talk to their member lenders about credit file freeze, a potent anti-ID theft tool that could also hamper lenders’ ability to provide service to their customers, according to Rod Griffin, manager of public education at Experian. Experian, Equifax, and Trans Union, which…