@jr_decasa 

If the steps below don't resolve the issue, please reply back to this post. 

1. Check for VPN or Network Proxy: Ensure that no VPN or network proxy is enabled on your PC or phone, as these can trigger Google's unusual traffic detection.

2. Change DNS Server: Open the Deco app, go to MORE > Internet Connection, and change the DNS server to 1.1.1.1 or 8.8.8.8. After updating the DNS server, reconnect your device to the Deco network to ensure the new DNS settings take effect. This can often resolve traffic routing issues.

3. Check Antivirus/Real-Time Protection: On several Deco models, the "Antivirus" or "Real-Time Protection" feature might interfere with normal traffic patterns. Check the Antivirus or Real-Time protection history to see if there's any relevant activity.

4. Review Parental Control Settings: Check the Parental Control settings, including content filtering and website blocking, to ensure nothing is affecting your Google access.

5. Verify ISP Issue: Disconnect the main Deco from the modem and connect your PC directly to the modem to verify if the same CAPTCHA issue occurs. This helps determine if it's an ISP-related issue.

Thanks 

  @jr_decasa 

Hi, 
Do you have the reported phenomenon on all the devices connected to the Deco network? 

You can also try connecting your device to another Wi-Fi network, using incognito mode in the browser, and then test whether the same phenomenon persists.

If so, as mentioned by @HelpFixDecoApp , it's recommended to disconnect the main Deco from the modem and connect your PC directly to the modem to verify whether the same CAPTCHA issue occurs. This helps determine if it's an ISP-related issue.

Best Regards