I don't know if you still have this froggy or not, but I to have a grey tree frog that I have had since he was a froglet. He was very high strung when he was younger. I have had him for 3 years this spring and about half way through last fall he started to settle down (a lot). Like I said he was VERY high strung and then it seemed like over night he settled in to being in captivity or something and just stopped climbing the walls of his home for hours on end. I thought he might be getting depressed or sick but with in a few days of him stopping his erratic behavior, he started singing (calling) for the first time since we had had him (which is how I know he is a boy). I think what had happened is he finally settled in to his niche within our family and on top of that he may have reached or is reaching sexual maturity. He is a perfectly happy little frog now, he only climbs the walls on feeding day as he knows food will be coming soon and I think he is trying to get my attention so I will feed him early, lol. Your frog may be experiencing something similar and has started to mellow out a little. I do know that young greys will wander for a long time until they feel they have found their own territory. Since he is a little older now he may have realized that his home is his territory, lol. Greys are pretty mellow frogs for the most part. Honestly, he should be perched quietly in a corner or on a leaf for most of the day. That's just how they are. I hope all worked out with him and he is still with you. My Greys are the sweetest frogs I have ever owned and I am glad they were my first love in the herp world! Hope my post helps out, even if only a little. And if anyone sees something I was wrong about, please feel free to correct me. I want to be as up-to-date as possible on my froggy facts! Thanks!