Wage reporting when hours change weekly - what worked for you?

I work some days through a staffing agency while still certifying. I have read a lot of threads here and could not find my exact situation. Sometimes my paycheck is late by a week. Did anyone get an overpayment notice from a mistake?

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.