I've installed Ubuntu 20.04.3 LTS. The computer crashes and restarts several times a day. I can't find the reason. Please help
Details of my computer:
System: Host: xxx Kernel: 5.13.0-28-generic x86_64 bits: 64 Desktop: Gnome 3.36.9
Distro: Ubuntu 20.04.3 LTS (Focal Fossa)
Machine: Type: Desktop Mobo: ASUSTeK model: Z170-P v: Rev X.0x serial: <superuser/root required>
UEFI [Legacy]: American Megatrends v: 3805 date: 05/16/2018
CPU: Topology: Quad Core model: Intel Core i5-6600K bits: 64 type: MCP L2 cache: 6144 KiB
Speed: 800 MHz min/max: 800/3900 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800
Graphics: Device-1: NVIDIA GP106 [GeForce GTX 1060 6GB] driver: nvidia v: 510.47.03
Display: x11 server: X.Org 1.20.13 driver: nvidia unloaded: fbdev,modesetting,nouveau,vesa tty: N/A
OpenGL: renderer: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2 v: 4.6.0 NVIDIA 510.47.03
Audio: Device-1: Intel 100 Series/C230 Series Family HD Audio driver: snd_hda_intel
Device-2: NVIDIA GP106 High Definition Audio driver: snd_hda_intel
Device-3: SteelSeries ApS SteelSeries SC2 USB Headset type: USB driver: hid-generic,snd-usb-audio,usbhid
Sound Server: ALSA v: k5.13.0-28-generic
Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169
IF: enp6s0 state: up speed: 1000 Mbps duplex: full mac: 70:4d:7b:65:83:0c
Drives: Local Storage: total: 2.28 TiB used: 15.72 GiB (0.7%)
ID-1: /dev/sda vendor: GOODRAM model: N/A size: 223.57 GiB
ID-2: /dev/sdb vendor: Western Digital model: WD7500BPVT-80HXZT3 size: 698.64 GiB
ID-3: /dev/sdc vendor: Samsung model: HD103SI size: 931.51 GiB
ID-4: /dev/sdd model: SSDPR-CX400-512 size: 476.94 GiB
Partition: ID-1: / size: 28.04 GiB used: 12.41 GiB (44.3%) fs: ext4 dev: /dev/sdd5
ID-2: /home size: 62.51 GiB used: 3.31 GiB (5.3%) fs: ext4 dev: /dev/sdd7
ID-3: swap-1 size: 7.63 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sdd6
Sensors: System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: nvidia temp: 57 C
Fan Speeds (RPM): N/A gpu: nvidia fan: 28%
Info: Processes: 300 Uptime: 19m Memory: 15.57 GiB used: 2.12 GiB (13.6%)