Easiest solution is to tighten up the bolts that attach the glass to the sunroof frame, like every other bolt and screw they seem to have not been tightened properly. If that fails, best bet is to remove the sunroof and refit it to make sure its fitted properly, either that or renault apparently do an anti rattle pack for the sunroof which is supposedly free, due to the design fault, but i havent checked this one out yet.