The SP7 i7/16/256 is having a similar issue too.
While writing in Onenote or drawing with the Slim PEN, the touch function crashes. You still can use Keyboard and Mouse. It is just the touch function that goes away.
I did troubleshoot several times. I call MS Support several times. I did factory restet quite a few times. It resolved nothing. I did upgrade to 2004 and 2H20 did not fix it.
I received a replacement unit 5 days ago. Same issue.
It keeps crashing randomly. Sometime 5min after start, sometimes a few hours and sometimes just 2-3min. I am working in IT. I cannot get a rime out of this.
I was using my finger yesterday, the whole evening and it did not crash. Now I am asking myself if it could be PEN related
The Firmware on MS pages are for Build 1903, but my SP7 get shipped with 1909.