Outlook may become disconnected due to various reasons, affecting email communication and productivity. One common cause of outlook disconnected is a fluctuating internet connection or network issues, disrupting the connection to the mail server. Additionally, incorrect account settings or outdated Outlook versions can lead to disconnection problems. Email account security settings, such as two-factor authentication, might also impact the connection. Moreover, antivirus or firewall software can interfere with Outlook's network access.
https://comfix365.com/blog/outlook-disconnected/