This morning my wife was showering and said the pressure dropped significantly. We've never had a problem with water pressure so this is odd. My first thought was that water must be escaping somewhere. I walked around the house while the shower was on and I didn't find water shooting out of any pipe or hear any water running other than in the drain. I tried the tub (separate) and other faucets around the house and the pressure didn't seem low but it might just be more obvious in the shower. We didn't lose any heat in the water temp and nothing that uses water was running at the same time.
What can I do to further troubleshoot this problem?