What to do if coffee extraction is unstable? Experience with morning shift calibration and output.

If coffee extraction is unstable, don't blame the machine right away. The first three things I check on the morning shift are: have the beans reached room temperature, was the grinder cleaned properly yesterday, and have the dose and water temperature been re-checked according to the day's conditions? Once the humidity changes, the grind setting that worked yesterday might not be stable today. A…