Hi Rui,
my hosting guys have had a look and can’t seem to find any issues in the database or htaccess.
When I set the standard maintenance page it all works fine (still insists on showing the neighborhood logo though).
But when I use the custom maintenance connected to a maintenance page I created on the same site, which should load like any other page, all browsers show too many redirect error. Google page analytics shows over 10 redirects.
All i have in my htaccess is the standard WordPress rules.