With the mobile version specifically I get this ALL THE TIME, I have tried to uninstall and reinstall the extension many times.
I frequently get this, may be during the transition to the browser being active.
_The 1Password browser extension needed to restart
If 1Password is working as usual in your browser, you can close this tab.
If you're having trouble, you may need to quit and restart your browser or sign in to your 1Password account again._