Manjaro only boots after first or second force reboot

[freggel.doe]

[HowTo] Provide System Information

This tutorial is superseded by this one. Remember all Tutorials are wiki posts that can be edited by TL2 (Trust Level 2) members and above. Welcome to Manjaro! To allow all of us helpful people on this forum TO HELP YOU, we need some basic information about your system. This probably means you described the symptoms of your problem, but now we need some more information to know where the origin of your issue is exactly. Someone else probably linked you to…

@fkoch

I don’t even know in which log-files should look

Check your journal of the previous boot when your force-reboot works:

$ journalctl -b -1