Make sure you are not spraying too far away so the solvent doesn’t evaporate.

I do one application. Light coat wait 5 minutes. Medium coat wait 5 minutes. Last coat if needed — done. No sanding.

You want enough paint so it smooths out but not too much so it runs.

Also — what is your technique? Always maintain a wet edge with 50% overlap as you go.

Here are some possible reasons: https://www.hometalk.com/16959183/q-rough-sandpapery-feel-to-spray-paint