I'm just jumping into this thread aswell - I've noticed the same issue on my Surface Laptop 3 (i7, 16Gb).
I'm running the Windows Insider (slow ring) on mine though, but am using the latest drivers & firmware for the device.
I suspect it's a driver issue as like Carlo_GLA mentioned, it's very random. Sometimes it will happen several times in a row, sometimes I only notice it happening once that day.
I also have the same alert in the System Event Log. "Display driver igfxn stopped responding and has successfully recovered" Event ID 4101