Hello! I use an Arch Linux distro with KDE on an ASUS X570 board that has built-in wifi.
The issue is that I can't for the life of me get the wifi to work without asking me for the wifi password what feels like every hour.
The hardware is active, the software is active, Network Manager is active, the wifi profile is fine, the SSID is fine, the security type is set properly, the password is saved and set to use for all users. I've tried restarting Network Manager, installing Network Manager with iwd backend, updating my system, restarting my system, and using nmtui to force home wifi.
I have noticed other people with kwallet issues, but that only affects me when I restart my system (asks for password). Other than that, I can't find a way to edit or disable kwallet without installing a 2-star app on the KDE Discover store that might not work and is reviewed as extremely annoying.
I have checked for for anything to do with kwallet in settings and searched for it with kwin. Kwallet doesn't exist in either of those for me, only at system restart.
Try installing kwallet-pam. It will remember your secrets through PAM when you log in. Arch does not have kwallet-pam installed by default unless you install via plasma-meta package.
If you use Chromium, you will not be asked for creating a password store as well so that is another bonus for kwallet-pam.
Kwallet shouldn't ask for password on each start of the system unless you set a different password for it than for your user account. If those are the same and the kwallet is named kwallet (or something like that, it's the default name) then it automatically unlocks on user login
I just apt uninstalled kwallet on my systems, or used the options in systemsettings to disable the subsystem.
I believe if you manually edit the wireless network and set it as "available to all users" that will also work around this, though resulting in the password being stored in plaintext in one of the NM config files