He was a bit beyond the 3 year mark.
He's slowly going back to a slightly more mellow guy. I'll never trust him but I have developed a newer routine and have accepted the fact that he's not a relaxing, stress free type of pet.
I'm not sure if the changes were a result of summer heat or because his hormone levels finally topped off and he's fully mature.
He's due for a complete cage cleaning and I may change a few things in the cage this fall.
I don't think you'll have many issues honestly.