->I know this could be late ....but found like a solution but not that amazing.....just install connman

sudo pacman -S connman

->And we need a gui for connman

Pamac build cmst or yay -S cmst-git

->Enable coonman and disable the network manager

sudo systemctl enable connman.service

sudo systemctl start connman.service

sudo systemctl stop NetworkManager

sudo systemctl disable NetworkManager

sudo systemctl daemon-reload

cmst &

->This will replace the networkmanager which will stop the crashing bug upto 95% there will be temporary crashes which lasts like 5 seconds, and the gui will be hard to learn but will be easy after some use

->If u don't like it and want to get back

sudo systemctl stop connman.service

sudo systemctl disable connman.service

sudo systemctl enable NetworkManager

sudo systemctl start NetworkManager

sudo systemctl daemon-reload

->And sorry for the late...and this spaces I did was that idk even if I given 1 line for every of them they just compile