spags is going where I was going. I'm also wondering about the size of the cage. If I were you I would ditch the glass terrarium and go with an all screen cage like a reptibreeze or a higher end DragonStrand, Although there are other brands of all screen cages that'll suffice. If you have a 5 month old Male I would also suggest a size that will be his permanent cage like a large DragonStrand or the Atrium, also by DragonStrand. He needs more climbing space as well. A large cage does no good if he can't use all the space so make sure there are plenty of branches and vines To get from point A to point B.
75 W is definitely too much for a glass terrarium. They need different temp zones so they can thermo regulate which the glass terrarium doesn't allow. A screen cage will. If you are concerned with humidity levels you can also get the breeder series DragonStrand to help with that (no you don't have to be a breeder to get this cage)
I think he is trying to escape from the heat. He may also be restless d/t the size. I can't say with 100% certainty that these are the only things going on but I can say that these are things I would fix ASAP.