I think it may be a windows 10 issue? I have a completely different made/model laptop I just setup last week, running 1809 versus my SB2 running 1709, and the only software in common is Chrome and Symantec Endpoint Protection. My touchpad on this new device started freezing the same day I set it up especially when trying to use two finger scrolling. I guess it could be Chrome or Symantec but this started on my SB2 around the time there was a Windows 10 update in August and its possible that code was incorporated in 1809. Its not like the whole computer is freezing up because when the touchpad stops working I can use the arrows on my keyboard to scroll...
To be frank, I also notice this the most most when chrome is open on my SB2. Maybe some updates there?