ПК неожиданно выключается

При работе с Ubuntu 18.04.2 мой компьютер случайным образом выключается без видимой причины, даже если уровень заряда батареи высокий (например, 80%). Это никогда не происходит при запуске Windows.

Вот два журнала перед двумя разными событиями:

Jul 12 08:51:55 uHP2017 dhclient[21348]: DHCPREQUEST of 192.168.43.88 on wlo1 to 192.168.43.1 port 67 (xid=0x54b2dd8)
Jul 12 08:51:55 uHP2017 dhclient[21348]: DHCPACK of 192.168.43.88 from 192.168.43.1
Jul 12 08:51:55 uHP2017 NetworkManager[983]: <info>  [1562914315.8307] dhcp4 (wlo1):   address 192.168.43.88
Jul 12 08:51:55 uHP2017 NetworkManager[983]: <info>  [1562914315.8308] dhcp4 (wlo1):   plen 24 (255.255.255.0)
Jul 12 08:51:55 uHP2017 NetworkManager[983]: <info>  [1562914315.8309] dhcp4 (wlo1):   gateway 192.168.43.1
Jul 12 08:51:55 uHP2017 NetworkManager[983]: <info>  [1562914315.8310] dhcp4 (wlo1):   lease time 3600
Jul 12 08:51:55 uHP2017 NetworkManager[983]: <info>  [1562914315.8311] dhcp4 (wlo1):   hostname 'uHP2017'
Jul 12 08:51:55 uHP2017 NetworkManager[983]: <info>  [1562914315.8311] dhcp4 (wlo1):   nameserver '192.168.43.1'
Jul 12 08:51:55 uHP2017 NetworkManager[983]: <info>  [1562914315.8312] dhcp4 (wlo1): state changed bound -> bound
Jul 12 08:51:55 uHP2017 dbus-daemon[928]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.11' (uid=0 pid=983 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
Jul 12 08:51:55 uHP2017 systemd[1]: Starting Network Manager Script Dispatcher Service...
Jul 12 08:51:55 uHP2017 dbus-daemon[928]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jul 12 08:51:55 uHP2017 systemd[1]: Started Network Manager Script Dispatcher Service.
Jul 12 08:51:55 uHP2017 nm-dispatcher: req:1 'dhcp4-change' [wlo1]: new request (1 scripts)
Jul 12 08:51:55 uHP2017 nm-dispatcher: req:1 'dhcp4-change' [wlo1]: start running ordered scripts...
Jul 12 08:51:55 uHP2017 dhclient[21348]: bound to 192.168.43.88 -- renewal in 1278 seconds.
Jul 12 08:54:57 uHP2017 NetworkManager[983]: <info>  [1562914497.2530] manager: NetworkManager state is now CONNECTED_SITE
Jul 12 08:54:57 uHP2017 whoopsie[20111]: [08:54:57] offline
Jul 12 08:54:57 uHP2017 dbus-daemon[928]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.11' (uid=0 pid=983 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
Jul 12 08:54:57 uHP2017 systemd[1]: Starting Network Manager Script Dispatcher Service...
Jul 12 08:54:57 uHP2017 dbus-daemon[928]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jul 12 08:54:57 uHP2017 systemd[1]: Started Network Manager Script Dispatcher Service.
Jul 12 08:54:57 uHP2017 nm-dispatcher: req:1 'connectivity-change': new request (1 scripts)
Jul 12 08:54:57 uHP2017 nm-dispatcher: req:1 'connectivity-change': start running ordered scripts...
Jul 12 08:55:08 uHP2017 whoopsie[20111]: [08:55:08] Cannot reach: https://daisy.ubuntu.com

и другое

Jul 12 09:13:25 uHP2017 gnome-software[2114]: plugin appstream took 5,1 seconds to do setup
Jul 12 09:13:25 uHP2017 gnome-software[2114]: enabled plugins: packagekit-url-to-app, desktop-categories, packagekit, packagekit-offline, packagekit-upgrade, os-release, packagekit-refresh, packagekit-local, fwupd, packagekit-refine-repos, shell-extensions, packagekit-proxy, systemd-updates, ubuntuone, appstream, hardcoded-blacklist, packagekit-refine, modalias, hardcoded-popular, generic-updates, rewrite-resource, hardcoded-featured, steam, desktop-menu-path, odrs, packagekit-history, provenance, snap, icons, provenance-license, key-colors, key-colors-metadata
Jul 12 09:13:25 uHP2017 gnome-software[2114]: disabled plugins: dpkg, repos, dummy, epiphany
Jul 12 09:13:25 uHP2017 dbus-daemon[915]: [system] Activating via systemd: service name='org.freedesktop.fwupd' unit='fwupd.service' requested by ':1.102' (uid=1000 pid=2114 comm="/usr/bin/gnome-software --gapplication-service " label="unconfined")
Jul 12 09:13:25 uHP2017 systemd[1]: Starting Firmware update daemon...
Jul 12 09:13:28 uHP2017 fwupd[2138]: disabling plugin because: failed to startup unifying: no kernel support for CONFIG_HIDRAW
Jul 12 09:13:28 uHP2017 fwupd[2138]: disabling plugin because: failed to startup dell: failed to initialize libsmbios library
Jul 12 09:13:33 uHP2017 fwupd[2138]: disabling plugin because: failed to coldplug amt: ME refused connection
Jul 12 09:13:33 uHP2017 fwupd[2138]: disabling plugin because: failed to coldplug synapticsmst: MST firmware updating not supported by OEM
Jul 12 09:13:33 uHP2017 boltd[1266]: power: setting force_power to ON
Jul 12 09:13:33 uHP2017 boltd[1266]: power: guard '2' for 'fwupd' active
Jul 12 09:13:33 uHP2017 fwupd[2138]: using plugins: csr, colorhug, wacomhid, steelseries, ebitdo, altos, upower, udev, nitrokey, dfu, thunderbolt, uefi, thunderbolt_power
Jul 12 09:13:33 uHP2017 fwupd[2138]: Daemon ready for requests
Jul 12 09:13:33 uHP2017 dbus-daemon[915]: [system] Successfully activated service 'org.freedesktop.fwupd'
Jul 12 09:13:33 uHP2017 systemd[1]: Started Firmware update daemon.
Jul 12 09:13:53 uHP2017 boltd[1266]: power: got event for guard '2' (10)
Jul 12 09:13:53 uHP2017 boltd[1266]: power: guard '2' for 'fwupd' deactivated
Jul 12 09:13:53 uHP2017 boltd[1266]: power: shutdown scheduled (T-20,00s)
Jul 12 09:13:56 uHP2017 PackageKit: get-updates transaction /1092_bebeaabc from uid 1000 finished with success after 30876ms
Jul 12 09:13:57 uHP2017 gnome-software[2114]: Only 0 apps for recent list, hiding
Jul 12 09:13:57 uHP2017 gnome-software[2114]: failed to call gs_plugin_add_category_apps on snap: lookup api.snapcraft.io: no such host
Jul 12 09:13:57 uHP2017 gnome-software[2114]: hiding category audio-video featured applications: found only 0 to show, need at least 9
Jul 12 09:13:57 uHP2017 gnome-software[2114]: failed to call gs_plugin_add_category_apps on snap: lookup api.snapcraft.io: no such host
Jul 12 09:13:57 uHP2017 gnome-software[2114]: hiding category games featured applications: found only 0 to show, need at least 9
Jul 12 09:13:57 uHP2017 gnome-software[2114]: failed to call gs_plugin_add_popular on snap: lookup api.snapcraft.io: no such host
Jul 12 09:13:57 uHP2017 gnome-software[2114]: failed to call gs_plugin_add_featured on snap: lookup api.snapcraft.io: no such host
Jul 12 09:13:58 uHP2017 gnome-software[2114]: failed to call gs_plugin_refine on packagekit-refine: failed to resolve package_ids: Timeout was reached
Jul 12 09:13:59 uHP2017 gnome-software[2114]: failed to call gs_plugin_refine on packagekit-refine: failed to resolve package_ids: Timeout was reached
Jul 12 09:14:00 uHP2017 gnome-software[2114]: Failed to load snap icon: local snap has no icon
Jul 12 09:14:00 uHP2017 gnome-software[2114]: message repeated 4 times: [ Failed to load snap icon: local snap has no icon]
Jul 12 09:14:03 uHP2017 PackageKit: resolve transaction /1093_dddabcde from uid 1000 finished with success after 2850ms
Jul 12 09:14:04 uHP2017 PackageKit: resolve transaction /1096_aceadbda from uid 1000 finished with success after 1643ms
Jul 12 09:14:04 uHP2017 gnome-software[2114]: Only 8 apps for popular list, hiding
Jul 12 09:14:13 uHP2017 boltd[1266]: power: setting force_power to OFF

Большое спасибо заранее