What do I say about why I left my last job? - 16 weeks in

They always ask why I left, and I freeze. I worked as a machine operator before this. I also do not want to seem like a risk. Do you mention numbers?

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.

Keep everything in writing and save the confirmation numbers. It saved me later.