In this post (which i hope to keep expanding) i'll keep my arch linux setup and the steps to reproduce it.

NetworkManager problems after rebooting or suspending and resuming.

tl;dr https://www.youtube.com/watch?v=P7bAp4vBxnA

I used to have a problem where after closing the lid of my laptop, Wi-Fi would disconnect (as it should) but then, when i opened it again it would take a long time to connect again or not connect at all. After some testing i realized the problem would also occur after shutting down wi-fi in any way (using fly-mode, disabling wi-fi in deepin or disconnecting from the network).

I tried several stuff for diagnosing the problem (like dmesg, journalctl, etc) which led me to reason 3 of wireless disconnect (DEAUTH_LEAVING) which was of no help at all because proposed solutions to this error code didn't worked. I didn't try to downgrade NetworkManager, because the problem was minor in previous versions but still happened (something like 15 seconds to connect). Right now it was taking more than 1 minute. Which, i have to admit is mildly infuriating.

I tried restarting the NetworkManager, which didn't worked.

I tried changing the dhcp client but it didn't work. (seemed to make no effect at all)

I tried rebooting (which sometimes worked, but after some time stopped working)

After that i tried the solution of this video https://www.youtube.com/watch?v=P7bAp4vBxnA, it didn't work right away. But after erasing the connection configuration in control center and input the password manually it worked. C