I have a very similar or the exact same issue, but with the touchpad used on 
Dell's XPS 9550.
In this case the touchpad being used as reported by "cat 
/proc/bus/input/devices" is: DLL06E4:01 06CB:7A13 Touchpad

It shows up if I run "xinput list" as well. However. I usually have a
generic Synaptics touchpad entry there as well, but in order for palm
detection to work I had to disable it by entering the following in "51
-synaptics-quirks.conf" under /usr/share/X11/xorg.conf.d:

# Disable generic Synaptics device, as we're using
# "DLL0704:01 06CB:76AE Touchpad"
# Having multiple touchpad devices running confuses syndaemon
Section "InputClass"
        Identifier "SynPS/2 Synaptics TouchPad"
        MatchProduct "SynPS/2 Synaptics TouchPad"
        MatchIsTouchpad "on"
        MatchOS "Linux"
        MatchDevicePath "/dev/input/event*"
        Option "Ignore" "on"
EndSection

Right after login it works just like it should and in Windows the issue
is not present so I know it's not hardware related. But after a random
amount of time the "tap to click" function and scrolling stops working.
The mouse pointer can still be used and the physical clicks work. It's
really annoying not being able to scroll or tap to click using the
touchpad. The options are enabled in the GUI settings.

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https://bugs.launchpad.net/bugs/1587913

Title:
  Ubuntu 16.04 Two finger scrolling/multitouch not working

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