this seems to work for me too..
At first I connected a separate trackpad , which improved things., but did 100 fix. Still had random movements and clicks from the cursor. This was kind of intermittent , but definitely no longer than 30 minutes without an attact.
2nd I noticed in the Accessibilty>Trackpad section you can disable the inbuilt trackpad. Did that , with now just the external trackpad to use and it works flawlessly. That would tend to suggest a hardware fault on my built in trackpad . I'd run the apple tests with no fails.
However just noticed this tip .. about unchecking and then checking the scrolling in Accessibility menu. Did that, and re-enabled the built in trackpad.. Been operating now for about 2 hours without problem.. so looking more and more like a MacOS Sierra issu.