I recently bought a 2016 Cannondale Synapse Carbon Disc road bike, which is working great -- however I notice that occasionally when my front wheel hits a bump (e.g. a small pothole or the lip of a driveway), the front fork (or something beneath it) goes into some sort of vibration mode and makes a noise that sounds a lot like the "twang" of a door-stopper for about a quarter-second.
It's a little surprising when this happens (both due to the unexpected sound and the vibration I feel through the handlebars), but I don't observe any obvious problems other than that.
My question is, is this sort of behavior normal/expected with this type of bike, or is it an indicator that something needs adjustment? (The quick-release lever seems to engaged tightly AFAICT, and there is no reflector mounted on the front spokes)