cat spraying?

soo my cat is 9 years old. hes only ever sprayed once or twice on my parents futon for some strange reason. he started going outside during the summer about 2 years ago when he started sneaking out, so we started letting him. he stays in during the winter.

i came home yesterday to my room smelling like a diaper. there was cat poop under my desk and he had sprayed all over my robe...today, i realized he had sprayed in almost every corner of my room...WHY?? nothing has changed! he is healthy! HE IS FIXED! as much as i love him, i might start keeping cinnamon sticks in the corners of my room, cats are allergic to those, its a common remedy for christmas tree climbing cats...