So i get extremely hot water when i first turn on the cold water. Well it takes a couple seconds then its scolding hot. Like straight out of hot water tank hot. Then after about 20 seconds it goes back to cold. Hot water does it with cold but not as troublesome. It seems like i waste about a gallon of water almost everytime i turn on my cold water waiting for it to get col enough to touch. Why does this happen and how can i fix it. It seems to be wasting tons of water?