most of the time it happens in cold weather or as the chry.,dodge,ply.,and jeep
get older the elec. selanos have grease in them and get thick and dry up.So they don,t go all the way to the unlock side of the selanos so slaming the door or sometime the hood.sometime giving them a shot of lube (wd40,or shutch) to sofen and get the grease going agian.