How Close Is Ur Lighting, If Its Darker Brown Than Its More Than Likely Caused By Heat Stress, If The Plant Is Young Wqatch To Not Over Water Or Over Fertilize And Make Sure Your Plant Is Getting Plenty Of Fresh Air Circualtion, If U Check All This And The Problem Still Occurs Do Not Prune The Leaves Let Them Die Natuarally And Fall Off But I Dont See It Neccessary To Come To That If All Of The Above Is In The Correct Condition