Wifi turns on and off with newest update

When I install Manjaro KDE, XFCE, or Cinnamon, my wifi works just fine. However, the moment that I do a full upgrade (sudo pacman -Syyu) and restart, my wifi begins to toggle on an off. This means not only is the wifi enabling and disabling, but the network applet is disappearing and reappearing over and over again. I'm having a very difficult time trying to solve it as I have no stable connection, therefore retrieving updates is virtually impossible without performing a fresh install.

I have tried to start and stop the NetworkManager service as well as disable and enable it, but this has no effect... I guess it might have something to do with my network card drivers. Could anyone help me here? This has been going on for a week now and I have not been able to find a solution.

My laptop is a Lenovo E540 ThinkPad.

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