Census jobs website problem

My mom has worked for the census before, and applied again this year.

This time, she keeps having an odd problem when trying to log in to the applicant site, where the page immediately gives a message that her account has been temporarily suspended due to too many invalid login attempts, and to wait an hour before trying again. This has happened on several different days, even on her first login attempt of the day. But other times it logs in ok.

I'm thinking it must be a problem with the website. But from doing a few searches, I haven't seen anyone else post about this problem.