It seemed to pretty well go away, not so noticable once one got into a little softer snow. I'm used to my RX1, with a bigger 159" paddle track that doesn't feel any different through the handgrips, between hard pack or soft snow, so was just a bit more concerned as if there was any underlying problem. It drove fine all day, and actually at the end of the day coming down the same trail/road I noticed no vibrations, it was gone, probably due to the trail being pretty soft and mushy. Like you say, probably just the hard ground and paddle track.