Your calorie intake is way too low for someone weighing 216 pounds. You should be consuming at least 4000 calories per day. You need enough to keep building lean muscle mass and to avoid losing what you've worked hard to earn.

1. Take a look at what you are eating.
a. are you eating regularly throughout the day (grazing)?
b. are your portions 'big' enough at each meal?
c. go back and recalculate what you need more of regarding proteins, carbs and fats.