Moved into a 90 yr old house. Has upgraded all - copper water supply lines. Also has very high pressure. When someone showers in a particular bathroom a loud resonating sound like a groan is heard all thru the house. In the basement I can feel the pipe making the sound and it is a branch off the main 3/4 line not servicing the bath being used at the time. The groan lasts a minute then disapates. What is going on? Any ideas?