刚刚安装了 ubuntu 20.04，一段时间后经常冻结。有人能帮帮我吗？
free -h:
total used free shared buff/cache available
Mem: 7,5Gi 1,7Gi 4,2Gi 228Mi 1,6Gi 5,4Gi
Swap: 15Gi 0B 15Gi
❯ sysctl vm.swappiness
vm.swappiness = 60
❯ sudo lshw -C memory
*-firmware
description: BIOS
vendor: American Megatrends Inc.
physical id: 0
version: 2.70
date: 03/16/2018
size: 64KiB
capacity: 16MiB
capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification uefi
*-memory
description: System Memory
physical id: f
slot: System board or motherboard
size: 8GiB
*-bank:0
description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 2400 MHz (0,4 ns)
product: V-GeN D4S4GL26A16TS6
vendor: Samsung
physical id: 0
serial: 00000032
slot: DIMM 0
size: 4GiB
width: 64 bits
clock: 2400MHz (0.4ns)
*-bank:1
description: DIMM DDR4 Synchronous Unbuffered (Unregistered) 2400 MHz (0,4 ns)
product: V-GeN D4S4GL26A16TS6
vendor: Samsung
physical id: 1
serial: 00000032
slot: DIMM 0
size: 4GiB
width: 64 bits
clock: 2400MHz (0.4ns)
*-cache:0
description: L1 cache
physical id: 11
slot: L1 - Cache
size: 384KiB
capacity: 384KiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=1
*-cache:1
description: L2 cache
physical id: 12
slot: L2 - Cache
size: 2MiB
capacity: 2MiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=2
*-cache:2
description: L3 cache
physical id: 13
slot: L3 - Cache
size: 4MiB
capacity: 4MiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=3
❯ sudo dmidecode -s bios-version
2.7
0