Hi @AZxyz,
Could you please post the output of the following terminal commands in order to see what is happening?
journalctl -f -t NetworkManager
dmesg | grep NetworkManager
At last, you can read this post where @jrichard326 suggested to read a solution from another forum that worked.
‘Slow internet: WiFi Atheros QCA9565 / AR9565 Wireless Adapter - #20 by jrichard326’
Regards,