Sometimes computer doesn´t boot into GUI

I have the problem, that the computer doesn´t boot into GUI - instead the monitor goes into Standby mode.

I can switch to TTY2, login and reboot the computer.

When this occur again, which logs should I provide?

Here is the Xorg.0.log

Any other log I should post here ?

inxi -Fza:

System:    Kernel: 4.19.163-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 
           parameters: BOOT_IMAGE=/vmlinuz-4.19-x86_64 
           root=UUID=b2532996-24ad-41a0-83dd-5149e4b5c392 rw quiet apparmor=1 security=apparmor 
           Desktop: Xfce 4.14.3 tk: Gtk 3.24.23 info: xfce4-panel wm: xfwm4 dm: LightDM 1.30.0 
           Distro: Manjaro Linux 
Machine:   Type: Kvm System: Gigabyte product: N/A v: N/A serial: <filter> 
           Mobo: Gigabyte model: N3150ND3V serial: <filter> UEFI: American Megatrends v: F5a 
           date: 01/19/2018 
CPU:       Info: Quad Core model: Intel Celeron N3150 bits: 64 type: MCP arch: Airmont family: 6 
           model-id: 4C (76) stepping: 3 microcode: 368 L2 cache: 1024 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 12800 
           Speed: 745 MHz min/max: 480/2080 MHz Core speeds (MHz): 1: 505 2: 484 3: 658 4: 834 
           Vulnerabilities: Type: itlb_multihit status: Not affected 
           Type: l1tf status: Not affected 
           Type: mds mitigation: Clear CPU buffers; SMT disabled 
           Type: meltdown mitigation: PTI 
           Type: spec_store_bypass status: Not affected 
           Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization 
           Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, IBRS_FW, 
           STIBP: disabled, RSB filling 
           Type: srbds status: Not affected 
           Type: tsx_async_abort status: Not affected 
Graphics:  Device-1: Intel Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics vendor: Gigabyte driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:22b1 
           Display: x11 server: X.Org 1.20.10 driver: intel unloaded: modesetting 
           alternate: fbdev,vesa display ID: :0.0 screens: 1 
           Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2") 
           s-diag: 582mm (22.9") 
           Monitor-1: HDMI1 res: 1920x1080 hz: 60 dpi: 92 size: 530x300mm (20.9x11.8") 
           diag: 609mm (24") 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 400 (BSW) v: 4.6 Mesa 20.3.1 
           compat-v: 3.0 direct render: Yes 
Audio:     Device-1: Intel Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series High 
           Definition Audio 
           vendor: Gigabyte driver: snd_hda_intel v: kernel bus ID: 00:1b.0 chip ID: 8086:2284 
           Device-2: VIA VT1720/24 [Envy24PT/HT] PCI Multi-Channel Audio driver: snd_ice1724 
           v: kernel bus ID: 06:00.0 chip ID: 1412:1724 
           Sound Server: ALSA v: k4.19.163-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Gigabyte 
           driver: r8169 v: kernel port: e000 bus ID: 01:00.0 chip ID: 10ec:8168 
           IF: enp1s0 state: down mac: <filter> 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Gigabyte 
           driver: r8169 v: kernel port: d000 bus ID: 02:00.0 chip ID: 10ec:8168 
           IF: enp2s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
Drives:    Local Storage: total: 232.89 GiB used: 17.53 GiB (7.5%) 
           SMART Message: Required tool smartctl not installed. Check --recommends 
           ID-1: /dev/sda maj-min: 8:0 vendor: Samsung model: SSD 850 EVO 250GB size: 232.89 GiB 
           block size: physical: 512 B logical: 512 B speed: 6.0 Gb/s serial: <filter> rev: 2B6Q 
Partition: ID-1: / raw size: 79.38 GiB size: 77.64 GiB (97.80%) used: 13.02 GiB (16.8%) fs: ext4 
           dev: /dev/sda4 maj-min: 8:4 
           ID-2: /boot raw size: 1024 MiB size: 975.9 MiB (95.30%) used: 92.2 MiB (9.4%) fs: ext4 
           dev: /dev/sda2 maj-min: 8:2 
           ID-3: /boot/efi raw size: 50 MiB size: 49.2 MiB (98.43%) used: 266 KiB (0.5%) fs: vfat 
           dev: /dev/sda1 maj-min: 8:1 
           ID-4: /home raw size: 143.45 GiB size: 140.2 GiB (97.73%) used: 4.41 GiB (3.1%) 
           fs: ext4 dev: /dev/sda5 maj-min: 8:5 
Swap:      Kernel: swappiness: 60 (default) cache pressure: 100 (default) 
           ID-1: swap-1 type: partition size: 9 GiB used: 0 KiB (0.0%) priority: -2 
           dev: /dev/sda3 maj-min: 8:3 
Sensors:   System Temperatures: cpu: 26.8 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Info:      Processes: 170 Uptime: 1m wakeups: 10 Memory: 7.7 GiB used: 875 MiB (11.1%) 
           Init: systemd v: 247 Compilers: gcc: 10.2.0 Packages: pacman: 1215 lib: 401 flatpak: 0 
           Shell: Bash v: 5.1.0 running in: xfce4-terminal inxi: 3.2.01