I don't think it's only your instance. I'm on lemmy.world and every time I open Lemmy in a new tab, it seems to fail to retrieve my login credentials and I have to log back in again.

@[email protected] Could you look into this issue?

I seem to be getting randomly 'logged out' across reloads of the main page or post loads arbitrarily, refreshing the page again instead then recognizes I'm still logged in.