How to stop sharingd, unsolicited, acceptance window from spawning and disappearing instantly every time the computer starts?

I have been living with this for a long time, but now (hope with your help) I am committed to solve it because it doesn't look quite normal. Why this window of this sharingd process, shows up at boot time in desktop almost in milliseconds and disappears (like if it was granted with some kind of "auto click"). I don't share (wish not) anything with any other host in any net. This is a plain standalone home computer with its plain vanilla internet connection. Likely targets: com.apple.sharingd (signer: Apple Proper) com.apple.preferences.sharing.remoteservice (signer: Apple Proper) In my share settings I have all unticked (no file sharing, no remote services, nothing). And, why shows this behaviour if many other services start as well, but they don't throw "grant/acceptance windows" on desktop? If is a system necessary process I just don't want to remove it from disk (i. e. deleting the com.apple.sharingd...), but should be a way to disable it? I also don't want just to block it through firewall. I would like to do it the good way. Stopping the service, yes? Any command line string to stop it? Thank you.