Surface Book 2 GPU Driver disappears randomly after May 2019 update

I would also like to know when this problem will be solved, I rang tech support on Monday 19th Aug and he did not seem to know about the issue with May windows update. But my surface Book 2 has the same GPU and is behaving exactly as yours.  The tech fellow uninstalled the Nvidia GeForce GXT 1050 and reinstalled but no difference it still disconnects at random. And the odd blue screen with Driver Power State Failure and then it reboots.   I bought the Surface Book 2 for my photography work and is so frustrating that I cannot use the Surface for what I bought it for!!  Microsoft needs to fix this ASAP, for this to happen on a high end device just 12 months old is not good. So far seems to be no good news to be had!

Thanks for the reply, Entegy. 

I tried reverting back to V1809 as soon as I found out that this was an issue, but it was well past the 10 day window allowing the reversion from v1903.

I ask respectfully, how are you so sure the issue is in software and not in hardware?  I actually own 2 of these devices, and the first one - purchased February last year - had reported device driver loading/starting issues for the GPU when it was first started brand new out-of-the box.  So I can attest that the GPU on that device didn't work initially, which was well before v1903.  It did eventually load and operate normally, although I did wonder why it should have had such a problem straight out of the box.

It is beginning to appear this discrete 1060 GPU was grafted onto a system with an integral UHD620 display adapter, and that maybe it wasn't such a harmonious union.  Nvidia's website support doesn't address issues with this particular GPU directly, and they appear to have distanced themselves from it.  I've attempted to use their latest driver's nonetheless in the hope that it would fix this GPU issue, but instead it caused a hardware lock error on the tablet.  Only by rolling the driver back to 388.08 did the hardware lock error go away.  So now I'm back at driver 388.08 for the foreseeable future, which isn't doing any good since the GPU drops out of the device driver list anyway.

So after all that rambling, what to do?  Ask for a refund?  After all, they (Microsoft) broke the thing.

The issue is unique to the Surface Book 2, but the delay in any solution from MS to such a sever issue has eroded my trust in currently investing further in their hardware.