Mouse scroll zooming much faster (Mac)

I have just updated to Sketch Up Pro 2016 and I’m using Mac OS Sierra. Since installing 2016 my mouse seems less stable and when I lightly scroll I’ll suddenly jump around from close up to the model to way back from it. This is very irritating and is adding lots of time to my drawing. Any ideas?
I hope my description makes sense - its not that the cursor moves - it’s more that I’m up close and then far away from my model…

is this true when cursor is over an object as compared to open space?

both when I’m working on models in 3d models and 2 d sketch plans