I have recently switched from Ubuntu to Manjaro, both with KDE Plasma. After boot, most times - but not always - in addition to the applications I have set to autostart (browser, e-mail etc.), two instances of Pamac Qt are also started. This is independent of whether or not there are any available updates. How can I get rid of them?
KDE Plasma Version 5.19.5
KDE Frameworks Version 5.73.0
Qt Version 5.15.0
Kernel Version 5.8.6-1-MANJARO
TIA.
Welcome to the forum! 
This is because there was probably a Pamac session running already when you rebooted, and the session got saved.
Open up the System Settings and navigate to… 
Workspace → Startup and Shutdown → Desktop Session
Make sure that “Start with an empty session” is selected, click Apply, close all windows, and log out ─ rebooting isn’t necessary.
When you now log in again, you shouldn’t have anything running except for the applications you’ve selected to automatically start on login. 
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