[Dovecot] Command died with signal 11: "/usr/libexec/dovecot/dovecot-lda"

Hi..

after upating from 2.0.1 to 2.0.4 postfix often reports errors when deliveing mails to dovecot:

"Undelivered Mail Returned to Sender" -> Command died with signal 11: "/usr/libexec/dovecot/dovecot-lda"

anyone seens this before ?