I recently purchased a young Areca Palm from the nursery. I re-potted it in a large 12" pot for room to grow, and am using a well-draining soil. I've been giving it a light misting daily, and initial watering about three times/week. The tips of the leaves have been slowly browning, and now I notice that the new fronds are coming up brown. Is this a possible root-rot? I am new to these plants but I've read that it's very easy to over or under-water; but how can I be sure? What are these symptoms most likely conducive to?

Thanks in advance!