Quality First Plumbing always provides great service when they come out. I was having issues with my toliet and sink water shut-off valves shutting off(I would open and they would pop close).
The plumber crhecked my water pressure and it turns out it was set too high which was causing the water valves to close. My pressure regulator needed to be replaced.
He recommended that I wait before attempting to replace the valves to see if adjusting the water pressure would fix the issue. I was happy that I didn't have to incur the additional charges if not needed.