The "Connection Has Been Lost" error in QuickBooks Desktop typically occurs when the software loses its connection to the company file. This disruption can be due to network issues, such as a weak or unstable internet connection, server problems, or conflicts with other software. To resolve this, ensure your network is stable, restart QuickBooks and your computer, and verify that the server hosting the company file is operational. Regularly updating QuickBooks and your operating system can also help prevent this error. If the problem persists, consulting QuickBooks support may be necessary.
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