Switch Update December 2018 - Screen jumps

I updated my switch yesterday.....What on earth has happened !! When I am out and about on the farm the screen is continually jumping as I walk along...makes it very very uncomfortable to play......but.... I have discovered that if the animals are all in their barns the screen is stable.....if I let them out the screen jumps. I believe for the same reason it doesn't jump when its raining as they are all in their barns . Also it doesn't jump if I am anywhere else in the valley. I have six barns with 48 pigs and two barns with cows, goats, chickens etc. Please help as I am so enjoying myself on the farm and looking forward to the new things to find. Thank you