My coffee arabica plant leaves have been browning ever since I got it. It’s always the oldest leaves that brown while new ones are growing. Usually one or two leaves at a time start out with a couple brown spots which and then turn completely brown over a couple weeks and then fall off. Is this a problem or is this a natural process? My plant is in a really sunny spot but about 4 feet from the windows, so it only gets direct sunlight for a couple hours. I water it when the soil dries about twice a week (as recommended from the person I bought it from). I’ve also tried moving it to a shadier spot but the leaves stop growing and seems less happy overall.