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Thunderbird 78.12.0 - error message "The server imap.gmx.de has dropped the connection. The server is either down or there are network problems.".

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After updating Thunderbird Portable 78.10.0 (32 bit) to 78.12.0 I regularly get the error message "The server imap.gmx.de has dropped the connection. The server is either down or there are network problems.". I work with Win7 Prof. (32 bit). As soon as I install the version 78.10.0 again, the error is gone again. Therefore I suspect that the error is only caused by version 78.12.0. Therefore an update is excluded for me for the time being! Kind regards B. Schlösser

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After updating Thunderbird Portable 78.10.0 (32 bit) to 78.12.0 I regularly get the error message "The server imap.gmx.de has dropped the connection. The server is either down or there are network problems.". I work with Win7 Prof. (32 bit). As soon as I install the version 78.10.0 again, the error is gone again. Therefore I suspect that the error is only caused by version 78.12.0. Therefore an update is excluded for me for the time being! Kind regards B. Schlösser Translated with www.DeepL.com/Translator (free version)
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Modified by Wayne Mery

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What are your settings, and what is the antivirus and its mail settings? Using a VPN?

imap.gmx.net on 993, SSL/TLS, mail.gmx.net on 465, SSL/TLS, or 587, STARTTLS; authentication = normal password, User Name = email address

https://hilfe.gmx.net/pop-imap/imap/imap-serverdaten.html