User blog comment:Mikividosevicgasparotti/SETH COOPER IS A LOSER/@comment-2073908-20120102015817

Nobody changed their wands after the second movie. Ron broke his wand during the Chamber of Secrets and Neville broke his at the end of the Order of the Phoenix and Ron and Hermione both lost theirs during the Deathly Hallows but those are the only times. The reason the wands look different from the Third Movie onwards is because they wanted each wand to be unique for every character.