I don't know if this helps but in the past there's been a bug with Windows 10 where the computer fails to initialize/wake up the graphics card. So far there isn't any real fix besides some speculation that graphics drivers need to be updated.
Another suggestion that I have is that perhaps you haven't got enough power from the PSU heading to your graphics card. (Or perhaps the power supply is going out and not providing the watts it used to.) Most computers, such as Dell, have only a 300 watt PSU in them at the time of purchase unless you go out and get a seperate unit.
Hopefully I'm not spouting out bull shit but I could be. Those are just some of the solutions I had to my graphics card not working completely (or at all).