So I've been thinking about the issue on the SurfaceBook (2&3!). My colleague has a SB2 that has never dropped his GPU. We both run the same OS, firmware sets and drivers and both have the additional NVIDIA GPU. However, BOTH (SB2 & SB3) of my units are causing me the exact same problem and he has never had any issues. In one day I lost my GPU 7 times in one day. (I now leave both the Task Manager and Device Manager open. When the Task Manager drops the GPU, I scan for new hardware in the Display Adapters section of Device Manager and the GPU comes back). However, on the eight drop of the day the GPU could not be recognized any longer and I had to reboot the machine.
So, after getting frustrated, irritated and downright angry, I decided to see if there was anything about the design that might warrant the problem occurring on both units. According to ifixit, the upper section of the SB3 is where the real changes are (CPU, etc.) to the unit. However, the design of the lower keyboard section, which houses the GPU, is identical on both the SB2 and SB3 except for the GPU. After looking at several of the tear down videos and youtube videos about the GPU, I believe this is a hardware problem and NOT a software problem.
I don't have a fix for it but I do think there is plenty of evidence that this is a hardware issue and not software. I also believe that in Texas this may be a potential for the lemon law. I am going to contact the State of Texas to see if there is anything I can do. If not, then I will see if I can find someone who can talk with me about a class action. Based on the responses, I believe this issue to be considerably more widespread.