Wifi disconnecting often in Ubuntu 20.04

Sometimes wifi disconnecting repeatedly. Sometime disconnecting after hours or after 30mins, i couldnt find the cause. And sometimes when running sudo docker exec -it 96414b09135d bash also it disconnects after minutes. i tried setting sudo nano /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf wifi.powersave = 2 and tried 1. sudo ifconfig wlp2s0 down 2. sudo iwconfig wlan0 power off 3. sudo ifconfig wlp2s0 up 4. sudo service network-manager restart and tried systemctl list-unit-files --state enabled keyboard-setup.service enabled enabled ModemManager.service enabled enabled network-manager.service enabled enabled networkd-dispatcher.service enabled enabled Also tried, sudo wpa_supplicant -i wlan0 -D wext -c /etc/wpa_supplicant/wpa_supplicant.conf Successfully initialized wpa_supplicant Failed to open config file '/etc/wpa_supplicant/wpa_supplicant.conf', error: No such file or directory Failed to read or parse configuration '/etc/wpa_supplicant/wpa_supplicant.conf'. Also tried sudo nano /etc/NeworkManager/NetworkManger.conf [device] wifi.scan-rand-mac-address=no Tried : 1. sudo service bluetooth restart 2. sudo modprobe wl sudo lshw -C network 3. sudo apt install network-manager 4. git clone https://github.com/mehedihshakeel/BroadcomInstaller2017.git git clone https://github.com/prasathlk/BroadcomInstaller2019.git cd BroadcomInstaller2019/ ./Broadcom.sh Here /etc/pm/sleep.d$ ls 10_grub-common 10_unattended-upgrades-hibernate config Here echo "options QCA9377 fwlps=N" | sudo tee /etc/modprobe.d/QCA9377.conf options QCA9377 fwlps=N Here sudo nano /etc/dhcp/dhclient.conf #timeout 300; Here dpkg -S $(which NetworkManager) network-manager: /usr/sbin/NetworkManager Here is my apt policy network-manager network-manager: Installed: 1.22.10-1ubuntu2.2 Candidate: 1.22.10-1ubuntu2.2 Version table: *** 1.22.10-1ubuntu2.2 500 500 http://in.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages 100 /var/lib/dpkg/status 1.22.10-1ubuntu1 500 500 http://in.archive.ubuntu.com/ubuntu focal/main amd64 Packages Here are my sudo journalctl -fu NetworkManager [1637549618.0666] dhcp6 (wlp2s0): state changed unknown -> bound [1637549996.3364] sup-iface[0x55dc05fec3d0,wlp2s0]: connection disconnected (reason -3) [1637549996.4370] manager: rfkill: Wi-Fi now disabled by radio killswitch [1637549996.4374] device (wlp2s0): state change: activated -> unavailable (reason 'none', sys-iface-state: 'managed') [1637549996.4665] dhcp4 (wlp2s0): canceled DHCP transaction [1637549996.4666] dhcp4 (wlp2s0): state changed bound -> done [1637549996.4672] dhcp6 (wlp2s0): canceled DHCP transaction [1637549996.4672] dhcp6 (wlp2s0): state changed bound -> done --------------------- [1637553729.6989] sup-iface[0x55dc05fec1f0,wlp2s0]: connection disconnected (reason -3) [1637553729.6992] device (wlp2s0): supplicant interface state: completed -> disconnected [1637553729.6992] device (p2p-dev-wlp2s0): supplicant management interface state: completed -> disconnected [1637553729.7093] device (wlp2s0): state change: deactivating -> disconnected (reason 'new-activation', sys-iface-state: 'managed') [1637553729.7305] dhcp4 (wlp2s0): canceled DHCP transaction [1637553729.7306] dhcp4 (wlp2s0): state changed bound -> done [1637553729.7314] dhcp6 (wlp2s0): canceled DHCP transaction [1637553729.7314] dhcp6 (wlp2s0): state changed bound -> done --------------------- [1637553946.7590] sup-iface[0x55dc05fec1f0,wlp2s0]: connection disconnected (reason -4) [1637553946.7982] device (wlp2s0): supplicant interface state: completed -> disconnected [1637553946.7982] device (p2p-dev-wlp2s0): supplicant management interface state: completed -> disconnected [1637553950.8662] device (wlp2s0): supplicant interface state: disconnected -> scanning [1637553950.8662] device (p2p-dev-wlp2s0): supplicant management interface state: disconnected -> scanning [1637553962.0505] device (wlp2s0): link timed out. [1637553962.0529] device (wlp2s0): state change: activated -> failed (reason 'ssid-not-found', sys-iface-state: 'managed') [1637553962.0610] device (wlp2s0): Activation: failed for connection 'WIFINAME' [1637553962.0650] device (wlp2s0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed') [1637553962.0985] dhcp4 (wlp2s0): canceled DHCP transaction [1637553962.0986] dhcp4 (wlp2s0): state changed bound -> done [1637553962.1123] manager: NetworkManager state is now CONNECTED_LOCAL [1637553980.3890] manager: rfkill: Wi-Fi hardware radio set disabled [1637553980.3891] device (wlp2s0): state change: disconnected -> unavailable (reason 'none', sys-iface-state: 'managed') [1637553980.3930] audit: op="radio-control" arg="wireless-enabled" pid=1512 uid=1000 result="success" [1637553980.3934] device (p2p-dev-wlp2s0): state change: disconnected -> unavailable (reason 'supplicant-failed', sys-iface-state: 'managed') [1637553980.3962] manager: rfkill: Wi-Fi now disabled by radio killswitch [1637553984.3856] manager: rfkill: Wi-Fi hardware radio set enabled [1637553984.6532] audit: op="radio-control" arg="wireless-enabled" pid=1512 uid=1000 result="success" [1637553984.6538] manager: rfkill: Wi-Fi now enabled by radio killswitch [1637553984.8032] sup-iface[0x55dc05fec100,wlp2s0]: supports 5 scan SSIDs [1637553984.8048] device (wlp2s0): supplicant interface state: starting -> ready [1637553984.8049] device (p2p-dev-wlp2s0): state change: unavailable -> disconnected (reason 'supplicant-available', sys-iface-state: 'managed') [1637553984.8055] device (wlp2s0): state change: unavailable -> disconnected (reason 'supplicant-available', sys-iface-state: 'managed')