hi,
in my debug log, I can see that:

 {536:Tue, 06 Mar 2018 08:48:18 GMT}
NOTICE: Use of undefined constant ADMIN_RIGHTS - assumed 'ADMIN_RIGHTS' in /home/.../public_html/zenphoto/zp-core/reconfigure.php on line 82
checkSignature called from reconfigureAction (reconfigure.php [12])
from require_once (functions-basic.php [162])
from require_once (functions.php [17])
from include (index.php [14])
from index.php [31]

{536:Tue, 06 Mar 2018 08:48:18 GMT}
NOTICE: Use of undefined constant ADMIN_RIGHTS - assumed 'ADMIN_RIGHTS' in /home/.../public_html/zenphoto/zp-core/functions.php on line 2302
zp_loggedin called from checkSignature (reconfigure.php [82])
from reconfigureAction (reconfigure.php [12])
from require_once (functions-basic.php [162])
from require_once (functions.php [17])
from include (index.php [14])
from index.php [31] 

is there a matter there ?

1.4.14 or support build? The support build has some changes in that area.

yes of course (almost the last commit)

On what occasion do you get this? I don't remember to have seen this since a while.

on average 2 to 3 times a day.

I used to get these a lot. I modified the reconfigure.php file to log accesses to it in case it was a script hacking bot or something.

See these now as well. Could be unwanted access attempt on runing setup. If you can please try the support build because of changes in that area.