Yep I also have the same issue (Surface Pro 7 i5) and I noticed that I also can not change the MSCONFIG options to be a Normal Startup boot, it is stuck in Selective Boot, no matter how many times I try to change it. My surface will shut down prematurely and occasionally will have serious screen flashing then lockup. Just out of curiosity for everyone who also can not solve this problem what is your startup showing at? FYI I'm sending mine back to Microsoft since I am fed up now beyond belief. Every option and suggestion online, there are two many to list, I have tried to reinstall things, change settings, remove stuff etc.
Sorry but if Microsoft wants to tout this device as awesome with a cool sleep mode that lets me just open my type cover and its on, then it better work. Instead I get greeted with a blank screen so I have to restart the computer to find my programs warning me of unexpected shutdown and having a Kernel-Power error 41 as well with this same error we all have.
Good luck.