Hi,

I expect it to be a problem in and with the readers (caching?).

The HTTP-header is:

HTTP/1.1 200 OK => 
Date => Mon, 17 Oct 2016 15:28:48 GMT
Server => Apache
X-Powered-By => PHP/5.3.26
Expires => Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control => no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma => no-cache
Set-Cookie => mlf2_last_visit=1476718128.1476718128; expires=Wed, 16-Nov-2016 15:28:48 GMT
Vary => Accept-Encoding
Connection => close
Content-Type => text/xml; charset=utf-8

No caching options are transmitted by the XML-file.

/Micha