I have a Dell XPS 15 9570 with an Intel i7-8750 and an Nvidia GeForce GTX 1050 Ti with Max-Q Design. I've recently noticed that after a certain amount of time my laptop is powered on, the discrete GPU just stops working. I try to pull up a game, but I get an error message saying stuff like my graphics card not being supported or my graphics card doesn't support DirectX. However, after I restart my laptop, it seems to work fine. I'm able to play a game for hours and have nothing go wrong. I also have the latest Dell and Windows updates, as well as the most recently released graphics driver for my XPS 15 (version 456.38). How can I fix this issue?