Its strange given the age of the animal. Normally they do that much earlier and after about 2 years settle into a good grove.

The only reasons they tend to get restless like that is for food, fresh water, temp, humidity, or maybe thrown off by a breed cycle. But without another one present I seriously doubt the last one.

What are you feeding it now? are your doing a transition of food size, FT, live, something like that? and what happened first did it start pushing first or stop eating first?