What does error message "Gmail is having authentication problems. Some features may not work. Try logging in to fix the problem." mean and how can I solve and fix it.
Gmail
*. Clear Cache and Cookies in your browser.
*. Disable your Adblocker addon/extension.
*. Disable your browser's addons/extensions, sometimes one of them cause this problem.
*. Update your browser to latest veresion.
*. If you are using privacy focused browsers like Tor and Mullvad, open your gmail account with another browser and see if that still happens.