With under watering the plant would be more limp. But it could be over watering. The top layer of the soil can dry out quickly if the air is dry. Underneath it could still be quite wet. A good way to check is to push a wooden skewer down into the pot. The moisture will show on the skewer if it's still wet. That temperature is cold but I wouldn't expect it to be the problem. Do you keep it warmer during the night?

Thank you so much for your response! I don’t think overwatering is the issue as I’ve left it alone since I’ve posted and another leaf is starting to turn brown. (The brown part of the leaf has also gone crunchy) I dug down a bit into the soil and it’s not wet. It is warmer at night then during the day. Could that be an issue? None of my other plants seem to have an issue with the temperature.

If you've only had it "a week or two" then it still probably hasn't resolved the issues it was having. The leaves would go 'crunchy' because of the dry air regardless of the cause of browning. Don't know what the implications of having colder days (daylight) than nights (dark) are on plants. It would help to keep the roots warmer, which should be good, but otherwise it's beyond me. If your other plants aren't adversely affected then it's probably not an issue.