I was noticing rapid and drastic temp changes on my hot side last week, and yesterday I figured it out. When my BP goes from the cool side hide to the hot side hide (he switches a few times a day) he lays on the temp probe for the digital thermometer, and it changes quickly, then slowly climbs! I couldn't figure it out so save my life....then I watched it happen, the temp reading came down almost 9 degrees in less than 1 minute.