no end of grub-mkconfig -o

[M. Zywek]

Hello, since more than a Year I have a problem with the command "sudo grub-mkconfig -o /boot/grub/grub.cfg". I starts to work, gives out the information of 10_linux and then hesitates. It does not come to an end.
If I take a look into my taskmanager, I see that the process grub-mount takes at about 27% of CPU. I kill that process and the command goes on to work. Most of the time I get a correct grub.cfg
Sometimes one of my operating systems is forgotten. It is always Antergos XFCE.

Boot section is sda; grub.cfg is layed down in sdd2. There are 5 OS on my machine. Win 10, LXQt-Manjaro, Antergos XFCE, Mate Manjaro, Linux Mint Mate 18.
If you need more informations, please ask me.
Sincerely, Michael Zywek

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