How to disable wifi power save Ubuntu 20.04

Hello, today I’ve installed new Ubuntu 20.04. Then I get the wifi problem. When system start, the wifi works fine. But a few moment later, it was dropped so I cannot connect to the internet. I disable wifi, then enable wifi, it works fine for some minutes and fall into problem again.

I see this link and try to edit file /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf change wifi.powersave from 3 (enable power save) to 2 (disable power save). And reboot. Now the wifi works fine.