TBH I've never experienced a BSOD caused by the Synaptics driver.
I see 3 possible causes:
1. Driver (needs update)
2. hardware (disable touchpad, see it problem disappears)
3. RAM (long shot TBH, but I've see bad RAM cause really weird issues.
Planned Purchase: T480s i5-8350 FHD Touch
Impulse Buy: Thinkpad not named for safety reasons RIP: X220 4291-C91X61 7676-A24760XD-U9E
I faced the same exact problem. After deactivating the touchpad in bios the problem went away. Were you able to rectify the issue? It seems like a new trackpad might be in order.