The first thing I would try is disabling the powersave of the power management.
sudo nano /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
You will see:
[connection]
wifi.powersave = 3
Change that 3 to a 2
[connection]
wifi.powersave = 2
Tap ctrl+o to overwrite, then the enter key to save the current configuration, then ctrl+x to exit the editor.
Reboot the notebook and test.
The powersave can be a bit overzealous about limiting wifi access in comparison to powerdrain.