Recently, my daughter couldn't get into her car with the key fob a number of times. She had the car checked by a garage and no problem existed at the time, no battery was changed but the problem went away. Today, my son couldn't unlock his car with the key fob. Two cars on the same street at the same time also experienced the issue. It was all over within about ten minutes and then they managed to unlock their cars. Are opportunists going for a car, which might be affecting people in the same area? Your thoughts and advice, please?