Elfeed update failed for... errors in GnuTLS -19. about elfeed HOT 3 CLOSED

;; second run
gnutls.c: [0] (Emacs) fatal error: The TLS connection was non-properly terminated. [3 times]
gnutls.c: [0] (Emacs) fatal error: An unexpected TLS handshake packet was received.
gnutls.el: (err=[-19] An unexpected TLS handshake packet was received.) boot: (:priority NORMAL :hostname www.simonsfoundation.org :loglevel 0 :min-prime-bits 1024 :trustfiles (/etc/ssl/certs/ca-certificates.crt) :crlfiles nil :keylist nil :verify-flags nil :verify-error nil :verify-hostname-error nil :callbacks nil)
Elfeed update failed for https://www.simonsfoundation.org/quanta-archive/feed: (:error (gnutls-error #<process www.simonsfoundation.org> -19))
Elfeed update failed for http://gdata.youtube.com/feeds/api/playlists/PLF8C97115E5BCBA92: (search-failed 

;; first run
Elfeed update failed for http://comicsthatsaysomething.quora.com/rss: (:error (error http 504))
gnutls.c: [0] (Emacs) fatal error: The TLS connection was non-properly terminated. [3 times]
Elfeed update failed for http://swannodette.github.com/atom.xml: (error XML: (Not Well-Formed) End of document while reading element `content')