Try to boot without qubes autostarting:
The following instructions are valid for Qubes OS R4.0 legacy mode and Qubes OS R4.1 legacy and UEFI modes. For Qubes OS R4.0 in UEFI mode, there is no GRUB, so manual boot from another operating system is needed. In several cases, there is a need to...
Maybe some PCI device attached to sys-net or sys-usb is causing this issue.
You can also try to add grub options to enable logs output to see the exact error:
Try to disable qubes autostart:
Maybe there is a problem with PCI passthrough in sys-net or sys-usb.
You can also enable additional logging but I’m not sure you’ll be able to see the reboot reason before it reboots:
For Xen command line (multiboot2 line): loglvl=all guest_loglvl=all vga=,keep noreboot=1
For kernel command line (first module2 line): console=hvc0 earlyprintk=xen plymouth.enable=0 panic=0
For kernel command line remove plymouth.ignore-serial-consoles rhgb quiet
You can also …
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