Check sprinkler filters and nozzles for clogs from particles or demanding water scale

https://kyleriliv329.zenbloomer.com/posts/winterizing-your-system-necessary-lawn-sprinkler-maintenance-tips

Check sprinkler filters and nozzles for clogs from particles or hard water scale. Routine cleansing restores spray styles, improves potency, and stops misting that wastes water to evaporation.