CentOS 7: 며칠 전부터 WiFi가 매우 느려지기 시작했습니다.

저는 CentOS 7을 사용하고 있는데 며칠 전부터 Wi-Fi 속도가 느려지기 시작했습니다. 다음은 내 출력 중 일부입니다(1Mbps 미만).

uname -a

Linux lhost.ldomain 3.10.0-1127.18.2.el7.x86_64 #1 SMP Sun Jul 26 15:27:06 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

ifconfig

enp0s31f6: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether d4:81:d7:e8:0b:cc  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 16  memory 0xef200000-ef220000  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 691156  bytes 541358280 (516.2 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 691156  bytes 541358280 (516.2 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:5e:a3:a5  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.2.107  netmask 255.255.255.0  broadcast 192.168.2.255
        inet6 2003:cf:732:1de0:b426:4f6f:c778:b5db  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::bb97:5650:6ef7:9493  prefixlen 64  scopeid 0x20<link>
        ether 1c:4d:70:c0:fb:1b  txqueuelen 1000  (Ethernet)
        RX packets 1473038  bytes 943223376 (899.5 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 718634  bytes 181148123 (172.7 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lspci -knn | grep Net -A2

02:00.0 Network controller [0280]: Intel Corporation Wireless 8265 / 8275 [8086:24fd] (rev 78)
    Subsystem: Intel Corporation Device [8086:0050]
    Kernel driver in use: iwlwifi 

iwconfig wlp2s0

wlp2s0    IEEE 802.11  ESSID: ***removed as suggested***
          Mode:Managed  Frequency:2.442 GHz  Access Point: ***removed as suggested***
          Bit Rate=144.4 Mb/s   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=55/70  Signal level=-55 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:14  Invalid misc:534   Missed beacon:0