Curious dovecot behavior with service_count = 0

Hello,

I'm not experiencing this problem at all with service_count = 1

With service_count = 0, this is what I got randomly in my logs:

TLS: SSL_read() syscall failed: Connection reset by peer

To be successfully logged, the user have to initiate a new connection.

I primary thought about vsz_limit but I've put this value to 10GB (yes this is very overkill, that was just for the test) and that don't change anything.

I use the lastest version of dovecot.

Any ideas ?

Thanks.