I have a question about side sprayer on my kitchen sink. It is a Moen. Until recently it seems to have worked fine. Now, the only way to get it to work is to push sprayer lever and turn water to medium. If i let up, the lever wont allow me to push it and I have to start over. It seems almost like there is too much pressure. It works fine if I hold lever while turning water on, but when I let up, there seems to be too much resistence. I used to be able to have sink fully on and press lever and worked fine. Not now. Any ideas?