My girlfriend has a 2010 Nissan Altima with keyless entry, remote and keyless start features. Some of the keyless remote features have to stop working. He cannot lock, unlock, open the trunk, or enable panic mode. For key start-up and entry attributes that require the use of a feature to close the key to the key file remote and they still work fine, none of the buttons We've altered the battery with no luck as well. Does anyone know what the problem might be or what we need to do?