I have noticed sub adults from the 600 - 1200g range seem to go off feed for a bit so I would not worry at all. I have had one go off feed for 6 months then go right back to pounding food every 7 days with no changes in the environment or anything else they just seem to decide not to eat for awhile sometimes. Keep an eye on its weight as long as its not loosing a lot of weight it will be fine just keep offering food on the same schedule or you could even start offering every 2 weeks or so until it eats again. You do not want to offer food to often it will not do any good it will eat again when its ready.