From your description my guess it is the cage. I say this because it was the same way Luna acted when I had her in a smaller cage (she was about 5 month when I got her). She would climb around a lot and ALWAYS want to come out. Once I got her into the 2x2x4 she doesn't want to leave it!
Of course there are other things to consider that you didn't mention: food (gutloaded insects), lighting (UVB), humidity, hydration (misting/dripper), supplements, etc.
You may want to post these as well so if there are any that may need adjusting, moving him into the new cage would be a perfect time for you to be sure all you are doing for him is the best. 
Also keep in mind that once he is in his new digs it will take him some time to adjust.
lele & luna
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0.1 veiled - Luna
0.2 green anoles Jaida & Jetta
0.1 brown anole - Jamaica
0.2 house geckos - Gaia & Tia
0.2 felines - Kyndra and Líta