If Settings - Shields: “Forget me when I close this site” is enabled then click on the Brave Shields icon in the address bar and in Advanced controls disable: “Forget me when I close this site”.
It is still happening. I saw another thread where a user mentioned a similar problem with Google services when using an authenticator and not a password. That may be related - we are required to use an authenticator after logging in with a password.
Also, there are a few redirects during the login process, so that may be at play.
But for now I’ve had to switch to Chrome so that I don’t need to relogin multiple times every day