Is there a way to prevent the 'Steam Mobile Error - From Validate Password 2' from happening in the future?

While you can't guarantee it won't happen, you can minimize the risk. Regularly check that your phone's time is accurately synchronized. Keep the Steam client and Steam Mobile Authenticator app updated. Securely store your recovery codes in multiple locations. Avoid using unstable internet connections or VPNs during login. And be cautious about clicking on suspicious links that could compromise your account.