Same thing started happening to me for last 3 days. I have exact same laptop with you. Gigabyte aero x16 RTX 5070 32 Ram Amd AI 7 350. I enabled Discrete Graphic (dGPU) Only (MUX Switch) from GiMate and it works well for now. Since this setting sets your RTX card work anytime you use your pc because it basicly disables AMD Integrated Graphics.
For my laptop when I checked Device Manager after some of these crashes I see (43) Error for my RTX graphic card. So I decided to do that. I think they will fix it with some sort of update.
Maybe it will help you too!