Are you using the latest 4.1 stable or 4.1 beta?
Has the ProFTPD server software or config been updated or changed recently?
The only thing I can think of off the top of my head is an old issue with SSL session reuse on proftpd but I thought this was a thing of the past.
You might try adjusting the SSL/TLS settings in the site manager, I will look into this and try to reproduce the issue on a local test machine.
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