When I turn on the faucet on my kitchen sink, it always shakes for a few seconds before the water starts to come out. At first the water dribbles out then it comes on normally. This problem is becoming progressively worse by the day. I think it might have to do with the sprayer that is a part of the faucet. I almost never use it and when I do try to use it the water just barely comes out. It sprays out very weakly. How can I fix this problem?