You might try navigating to /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf and changing the value wifi.powersave = 3 to wifi.powersave = 2
You can do this in terminal easily with
sudo nano /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
Once done, press ctrl+x to exit, then the y key to say yes to save, then the enter key to save as current configuration.
Reboot and test.
If you prefer the GUI method, elevate your File manager to Root
sudo -i
nautilus
Click in the Left Pane on "Other locations". Then select "computer". This should place you in Root directory.
Navigate to /etc/NetworkManager/conf.d/
Open default-wifi-powersave-on.conf in a text editor.
Change the value from 3 to 2.
Save and exit.
Reboot and test.