When I turn the hot water handel in my tub/shower water comes out fast at first for about one second then the water pressure drops substantially. To get the mix comfortable, the cold has to barely be turned on. I've noticed that the water pressure in the sink is lower for the hot than the cold, but it's not as noticable as in the tub/shower. I've included a couple of pictures to show what it looks like. Any idea what's going on? All I want is a comfortable shower in the morning! Thanks