When a batch operator calls you up on the phone all hyper at you and says this: "This morning, on the first 3 batches we had sand go out of tolerance! In the first load sand went out by 10,000 lbs! In the second and third sand went over by 3000 lbs! The gate just wouldn't close! Once we switched it to manual¹ then the gate closed. There HAS to be something wrong with the software!"
What he REALLY means is this: "This morning, on the first 3 batches we had sand go out of tolerance. In the first load, sand was over by about 3000 lbs and in the second it was over by 1000 lbs and in the third it was over by less than that. The gate just wouldn't close. Once we switched it to manual, we had to go out and beat on the gate to get it to close. This is obviously a mechanical problem and I should not have called you. Sorry about that."
I troubleshoot hours trying to fix these problems that have no connection with software at all!

¹manual - When you switch from automatic to manual mode, the computer released power on everything, causing all gates to close (you need to supply power to the gates to open them, so if there is no power, they close) and other dangerous high voltage devices to drop voltage.