Mac Wifi connection Dropping frequently

Recently My laptop MBP 2018 encounter the network issue frequently. The wifi will drop connection randomly. The symptom is lost connection with default gateway. Here is the note that I used to record what I did for troubleshooting.

1.check the wifi status

netwroksetup -getinfo Wi-Fi

netstat -nr -f inet

list all network devices to get wifi device id

networksetup -listhardwareports

The most WiFi device id is en0
networksetup -getairportpower en0

disable airdrop

sudo ifconfig awdl0 down

The Fix:
Disable WiFi
Open Finder
Press
Cmd+Shft+G
to go to the folder
/Library/Preferences/SystemConfiguration/
Delete (or move) the following files:
com.apple.airport.preferences.plist
NetworkInterfaces.plist
preferences.plist
Restart your computer
Re-enable WiFi