Mauro, are you growing this one alongside your other loddigesiis--and if so, are the other plants showing signs of dehydration too? Maybe you could try giving a little less light and watering it with a weak solution of a vitamin B concoction like Superthrive (this is the name brand here in the US, but I bet there's probably a Brazilian equivalent). I like the flower, so I agree that you should try to pamper it for just a little longer. Good luck!