Most of the time when using the sprayer on our kitchen sink, the water, both coming from the sprayer and sink, will begin pulsating. I have tried turning the water volume up and down while holding the sprayer on and all that happens is that the frequency of the pulsing changes. This is not only very annoying, but I’m concerned it might be part of a larger problem. I tried searching the Internet and cannot find any direct references to this type of problem. What is happening, why, and how do you fix it?