I have an eZip Trailz 2009 HEB with somewhere between 800 and 1100 miles on it. Recently, I can feel vibrations in the pedals and clicking noises coming from the front crankset that were never there before. I have not done anything out of the ordinary or put the crankset through a whole lot of stress. The manual suggests using lithium grease in the crankset, but I want to explore what other people say before I do that. Could this be caused by something else? The bike is well taken care of.