Google Map API v3 duplicate markersWithLabel when zoom out

Google Map API v3 duplicate markersWithLabel when zoom out

I have a map (google map api v3) with markersWithLabel at random position
in the whole world. When I zoom out Google map auto-duplicate map (it is
how the Google map deals with very low zoom levels) and duplicate markers
too but WITHOUT label.
So, How to hide this duplicate markers ? If it's not possible ... how to
force markersWithLabel to duplicate the label too ?
I just want to have a consistent view ...
Thanks !
Clément