This bug affects me as well but in ubuntu 20.04. It's very annoying.

I've open a question ->
https://answers.launchpad.net/ubuntu/+question/692509

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https://bugs.launchpad.net/bugs/1855793

Title:
  Wi-Fi becomes unusally slow all of a sudden and forces me to turn off
  Wi-Fi and then turn it back on

Status in linux package in Ubuntu:
  Confirmed
Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  Oftentimes, when I am using my PC, the Wi-Fi will drop all of a sudden
  and I will then be forced to turn the Wi-Fi off and then back on
  again, which is annoying. And even then, the Wi-Fi becomes unusually
  slow afterwards.

  Description:  Ubuntu 18.04.3 LTS
  Release:      18.04

  network-manager:
    Installed: 1.10.6-2ubuntu1.2
    Candidate: 1.10.6-2ubuntu1.2
    Version table:
   *** 1.10.6-2ubuntu1.2 500
          500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
          100 /var/lib/dpkg/status
       1.10.6-2ubuntu1.1 500
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
       1.10.6-2ubuntu1 500
          500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: network-manager 1.10.6-2ubuntu1.2
  ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
  Uname: Linux 5.0.0-37-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Dec  9 20:35:53 2019
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IpRoute:
   default via 192.168.1.1 dev wlp3s0 proto dhcp metric 600 
   169.254.0.0/16 dev wlp3s0 scope link metric 1000 
   192.168.1.0/24 dev wlp3s0 proto kernel scope link src 192.168.1.33 metric 600
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-con:
   NAME                UUID                                  TYPE      
TIMESTAMP   TIMESTAMP-REAL                   AUTOCONNECT  AUTOCONNECT-PRIORITY  
READONLY  DBUS-PATH                                   ACTIVE  DEVICE  STATE     
 ACTIVE-PATH                                         SLAVE 
   NETGEAR18           64704ba2-aba5-44de-ad4a-7d0de569815b  wifi      
1575941718  Mon 09 Dec 2019 08:35:18 PM EST  yes          0                     
no        /org/freedesktop/NetworkManager/Settings/1  yes     wlp3s0  activated 
 /org/freedesktop/NetworkManager/ActiveConnection/2  --    
   Wired connection 1  28634e82-4c1c-3a61-b152-3bd92aaa6992  ethernet  
1575939877  Mon 09 Dec 2019 08:04:37 PM EST  yes          4294966297            
no        /org/freedesktop/NetworkManager/Settings/2  no      --      --        
 --                                                  --
  nmcli-dev:
   DEVICE  TYPE      STATE        DBUS-PATH                                  
CONNECTION  CON-UUID                              CON-PATH                      
                     
   wlp3s0  wifi      connected    /org/freedesktop/NetworkManager/Devices/3  
NETGEAR18   64704ba2-aba5-44de-ad4a-7d0de569815b  
/org/freedesktop/NetworkManager/ActiveConnection/2 
   enp4s0  ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/2  -- 
         --                                    --                               
                  
   lo      loopback  unmanaged    /org/freedesktop/NetworkManager/Devices/1  -- 
         --                                    --
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  
WIFI     WWAN-HW  WWAN    
   running  1.10.6   connected  started  full          enabled     enabled  
enabled  enabled  enabled
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  seija      1543 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2020-04-04 (5 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 
(20200203.1)
  IpRoute:
   default via 192.168.1.1 dev wlp2s0 proto dhcp metric 600 
   169.254.0.0/16 dev wlp2s0 scope link metric 1000 
   192.168.1.0/24 dev wlp2s0 proto kernel scope link src 192.168.1.39 metric 600
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 0cf3:e009 Atheros Communications, Inc. 
   Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card 
Reader Controller
   Bus 001 Device 002: ID 0c45:6a06 Microdia 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Inspiron 5570
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  Package: network-manager 1.10.6-2ubuntu1.4
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-46-generic 
root=UUID=df2b8b4b-83d7-4462-9f0b-59a501f7e34e ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 5.3.0-46.38~18.04.1-generic 5.3.18
  RelatedPackageVersions:
   linux-restricted-modules-5.3.0-46-generic N/A
   linux-backports-modules-5.3.0-46-generic  N/A
   linux-firmware                            1.173.17
  Tags:  bionic
  Uname: Linux 5.3.0-46-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/15/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.2.3
  dmi.board.name: 09YTN7
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.2.3:bd05/15/2019:svnDellInc.:pnInspiron5570:pvr:rvnDellInc.:rn09YTN7:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: Inspiron
  dmi.product.name: Inspiron 5570
  dmi.product.sku: 0810
  dmi.sys.vendor: Dell Inc.
  nmcli-con:
   NAME                UUID                                  TYPE      
TIMESTAMP   TIMESTAMP-REAL                   AUTOCONNECT  AUTOCONNECT-PRIORITY  
READONLY  DBUS-PATH                                   ACTIVE  DEVICE  STATE     
 ACTIVE-PATH                                         SLAVE 
   NETGEAR18           4c46a7b6-0545-43ef-b9bb-adcd9750847e  wifi      
1586393206  Wed 08 Apr 2020 08:46:46 PM EDT  yes          0                     
no        /org/freedesktop/NetworkManager/Settings/1  yes     wlp2s0  activated 
 /org/freedesktop/NetworkManager/ActiveConnection/1  --    
   Wired connection 1  72505ff5-ec1c-36b6-b1f3-f3188add1bd5  ethernet  
1586393198  Wed 08 Apr 2020 08:46:38 PM EDT  yes          4294966297            
no        /org/freedesktop/NetworkManager/Settings/2  no      --      --        
 --                                                  --
  nmcli-dev:
   DEVICE  TYPE      STATE        DBUS-PATH                                  
CONNECTION  CON-UUID                              CON-PATH                      
                     
   wlp2s0  wifi      connected    /org/freedesktop/NetworkManager/Devices/3  
NETGEAR18   4c46a7b6-0545-43ef-b9bb-adcd9750847e  
/org/freedesktop/NetworkManager/ActiveConnection/1 
   enp1s0  ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/2  -- 
         --                                    --                               
                  
   lo      loopback  unmanaged    /org/freedesktop/NetworkManager/Devices/1  -- 
         --                                    --
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  
WIFI     WWAN-HW  WWAN    
   running  1.10.6   connected  started  full          enabled     enabled  
enabled  enabled  enabled

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