I have 2 usb ports if I leave a usb stick plugged in or move the mouse to the other port
it shuts down. (right now just leaving mouse there is prob most easy)
Or if I use this command setpci -H1 -d 8086:8c31 d0.l=0
which is used for this (How to force a USB 3.0 port to work in USB 2.0 mode in Linux?)
kills the ports but it shuts down ok.
So its most interesting a Usb issue
Any perm fixes most welcome