What can cause random shutdowns?

Hello,

I have a problem with my Surface Book. It shuts off randomly and I can't even figure out on what occasion. It works fine for a few hours and then shuts down. After it turns off, it cannot be turned on again even after connecting the charger, only the detach button lights up in red. It makes a very quiet whistling sound. I'm assuming it will be some component on the motherboard - does anyone know what exactly it could be?

Thanks for all the replies