Have not heard why, but if you do not want to get axed, don't steal time. And I am not being a smartass.
If you get a 10 minute break, take 10 minutes. Do not finish your break and sit there for 5 more minutes.
Same with your meal.
If your loads are ready, hook them up and leave. Do not hang around for 15 to 30 minutes before leaving.
When you are done, clock out. Don't hang around on the clock talking for 10 minutes.
I have seen terminations for all these scenarios. And there are more. You basically know when you are stealing time, even if it is only 5 minutes here and there.
I saw them fire a guy for taking 2 minutes extra on his break. Yes, he had other issues, but this is why they fired him.