> Can you post the whole config file so we can investigate?

My current config:

;; Prepare environment
(use-modules
 (gnu)
 (gnu packages base)
 (gnu packages admin)
 (gnu packages linux)
 (gnu packages emacs)
 (gnu packages xfce)
 (gnu packages gnuzilla)
 (gnu packages tmux)
 (gnu packages curl)
 (gnu packages video)
 (gnu packages version-control)
 (gnu services networking)
 (gnu system nss)
)
(use-service-modules networking desktop)
(use-package-modules bootloaders ssh)

;; Select packages
(define %pkg-group-base
  '("xfce" "slim" "emacs" "icecat"))
(define %pkg-group-dev
  '("gcc" "glibc" "gcc-toolchain" "git" "automake" "autoconf" "cmake" "make"
    "perl" "guile"
    "strace"
    "linux-libre-headers" "mesa-headers"))

;;; ================ other pkg groups definitions, omitted ================

(operating-system
 (host-name "guix")
 (timezone "Europe/Moscow")
 (locale "en_US.utf8")
 (bootloader (bootloader-configuration
              (bootloader grub-bootloader)
              (target "/dev/sdd")
              (menu-entries (menu-entry
                               (label "Old")
                               (linux "/boot/vmlinuz-4.14.9-calculate")
                               (linux-arguments '("root=/dev/sda3"))
                               (initrd
"/boot/initramfs-4.14.9-calculate.img")))
              ))

 (initrd-modules (cons* "sata_nv"        ;; Nvidia nForce
                        "pata_acpi" %base-initrd-modules))

 (file-systems (cons*
                (file-system
                 (device "two")
                 (mount-point "/")
                 (type "ext4")
                 (options "noatime,discard 0 1")
                 (title 'label))
                (file-system
                 (device "one")
                 (mount-point "/home")
                 (type "ext4")
                 (options "noatime,discard 0 0")
                 (title 'label))
                (file-system
                 (device "634a6369-c5a8-4f4c-b3e8-35fb92cf850e")
                 (mount-point "/mnt/WD-HDD")
                 (type "ext4")
                 (options "noatime")
                 (title 'uuid))
                %base-file-systems))
(swap-devices '("/dev/disk/by-uuid/0602935f-4ed2-4805-9ec9-e0c06238abf5"))

(users (cons (user-account
              (name "jone")
              (comment "Jone")
              (group "users")
              (supplementary-groups '("wheel" "netdev" "audio" "video"))
              (home-directory "/home/jone"))
             %base-user-accounts))

(packages (append (map specification->package
                       (append %pkg-group-base
                               %pkg-group-dev))
                  %base-packages))
(services (cons*
           ;; (dhcp-client-service)
           (xfce-desktop-service)
           %desktop-services)))