I'd get the door card off and see if something has come off the handle from the inside. I've not had the problem myself so couldn't say for certain what it is but get your arm up there and have a feel around for something loose I guess.
This has happened to a few members, might be combination of cold and plastic having an effect, member called Andy on here managed to fix hisby gluing it all back, he made a guide somewhere for it, ill try and dig it out.