I've done some research and found that yellowing/browning on the base can happen for several reasons.
- Root Rot from being too wet
- Not enough water
My guess is it is root rot because it is winter now and we have probably over watered inside.
To me it looks like it is dying and may not recover, I read one post that said cutting off the top and replanting it may save it. Is that true? Any advice on how to get it back to health would be greatly appreciated.