Replying to Brake release Problemo

Hey NS,
i own a pair of nx12 on 08/09 chronic's. i love the skis and bindings but sometimes when its colder outside(below 15) the bindings brake doesn't release...yes the brakes are wide enough for the ski but i had to find they didn't release the hard way( my ski went off a side of a trail and into a tree, i had to climb the tree to get my ski) and help on what i should do to my binding so it doesn't do that again.
+k for any help