My touchpad on my SB2 is still freezing up, especially when two finger scrolling. Its been like this for four months now since one of the updates which fixed my power button issue but introduced this lovely issue.
An interesting observation is since this issue surfaced (no pun intended), I have noticed my top-of-the-line SB2 struggle to do basic tasks and slows down to a crawl. Checking Task Manager and the Performance tab, I see plenty of available CPU, Memory, etc, yet the machine struggles. I am talking basic things like surfing the internet in Chrome or writing emails in Outlook. I have a feeling there is some memory or power management issue at play. I can't be certain whether the update applied to 1709 caused or my updating to 1803 is when it started. Perhaps its related to the Meltdown/Spectre patches? Closing everything down and rebooting regularly seems to fix it for a few days. You know how often I rebooted my Windows 7 machine, practically NEVER. Even my SB2 on 1709 with the power button issue, I never was forced to reboot. Microsoft introduced a bug and has yet to fix it months later, ugh.