Hi @mandywr14, Welcome to Community!
When you log out, do you shut down your machine?
Do you quit Brave?
Also, do you have any extensions installed?
yes I quit (force quit if necessary) all running programs then shut down. This seems to log me out automatically.
Can you confirm if you have any extensions installed?
no extensions as yet
correction .2 extensions , lastpass (password manager) and duckduckgo (search engine)
Does disabling those extensions help resolve the issue?