Owe,
I think we caught it!
Sometime ago you probably turned "Airplane Mode" ON. After this "Airplane Mode" should be started on every logon. To stop this behaviour the tools had to be stopped manually.
While starting on logon Airplane Mode checks existence of bluetooth devices and asks for confirmation to avoid disconnecting you from keyboard/mouse.
And if you say "No" then tool is not started. But because of the bug "Airplane Mode" doesn't remove itself from autostart in this case. And will be started again on next logon.
You have two ways to fix the issue.
1) Simple, but you must have non-bluetooth mouse or keyboard connected to you Mac mini:
- Just launch Airplane Mode, agree to disable bluetooth devices and then disable Airplane Mode again. After this the tool will not be started on logon
2) If you have only bluetooth mouse and keyboard or the first way haven't helped then write about it here and our support will send you full instruction privately
Anyway, thanks for reporting this bug, we'll fix it in the nearest release.