Stress can cause rabbits to moult as anyonewho's taken a rabbit to a vet will tell you, there is this phenomenathat seems to occur when you pull your rabbit out of the carrier, yourrabbit that was not shedding at home is suddenly losing clumps of fur.
Seriously, it happens quite often!
My opinion is that this is the 'teen years'. It normally occurs alittle sooner but one of my boys didn't hit it until her was 11 monthsold (neutered 6 months prior) so it can and does vary. He may beneutered but unfortunately that isn't a miracle and while it can helpin almost every case and it stops it in some case, it isn't a guarantee.
It is a territorial thing for sure. There are a few things you can dobut sometimes it's just a wait it out type of thing but the good newsis that is almost always passes within a few months with consistenthandling. One, try spraying him with a water bottle when he lunges atyou but this may not make it better and if he views you as a threat hemay still lunge or attack. Two, try wearing leather gloves if he'sbiting or if you're worried he might, this prevents you from gettinghurt but you must train yourself to resist the urge to pull back, heshould learn that he wont get you to leave by attacking you. Three,don't reach in his cage while he is in it, it's his territory andyou're invading it. Four, some rabbits get territorial if their cage istoo small. If you expand their territory then it
can help curbor lessen the territorial problems.
Now I used method 2 because my rabbits need to be picked up to be putin their run as well soit was importantto teachthem that I would not back off if they attacked me. It worked and now Ican reach in their cage and they could care less if I've climbed intotheir cage but they do get very curious. It takes time and patience.
Also, try using a reward system, start by putting your hand onlyslightly in the cage, if he doesn't attack, give him some of hisfavorite treat. He needs to associate your hand to good things. I alsohad the "well if you don't come or you attack me then obviously youdon't want to run" attitude and you would be surprised how fast theylearn to greet you at the door and to like you. It took about 3 weeksfor one of my bucks to learn that if he didn't come to the door or ifhe attacked me, he wouldn't get to go play in the run.
