I was playing a game on River City Night in a Stormcrow Prime (I), and partway through (possibly after taking damage), my mech's cockpit began to shake continuously for no discernible reason.
I wasn't being hit, I checked for nearby allies who were quickly jumpjetting into the air and landing, only to find none, I was simply standing behind the tower/citadel/large central building, waiting for it to stop.
It may have gotten better as I moved away from the large structure, and many of my teammates reported the same problem.