I have a double sink vanity, both of which have good quality (Grohe) 8 inch widespread faucets. Water pressure from one is great. Recently, and all of a sudden, the water pressure from the other one became very poor. With both hot and cold taps turned all the way, the water just kind of sputters out weakly. When I tap the aerator with my finger, it seems to wiggle a bit and the water pressure and pattern of flow changes slightly. Any ideas on how to fix this? I appreciate any input!