Error: file_ostream.net_set_tcp_nodelay

[Lefteris Tsintjelis]

After upgrading to 2.3.7_1 I get those errors every now and then. 
Running FreeBSD 12-RELEASE. Any idea what they may be?

Jul 13 08:07:11 pop3-login: Error: file_ostream.net_set_tcp_nodelay(, 
FALSE) failed: Connection reset by peer
Jul 13 08:19:10 imap-login: Error: file_ostream.net_set_tcp_nodelay(, 
TRUE) failed: Connection reset by peer
Jul 13 08:24:09 imap-login: Error: file_ostream.net_set_tcp_nodelay(, 
TRUE) failed: Connection reset by peer
Jul 13 08:34:53 imap-login: Error: file_ostream.net_set_tcp_nodelay(, 
TRUE) failed: Connection reset by peer

Lefteris