My house is an 110 years old frame two story building. There is an annoying clicking sound that emits from the living room and dining room ceiling. The sounds comes and goes without warning. It last from a few seconds to a couple of minutes. Sometimes the clicking starts slow and then it speeds up. Other times it remains slow. The clicking does not occur daily but has occurred more often since the summer. The clicking also occurs during idffernt times of the day morning, evening and overnight.