As the other person said, something is wrong if your machine is shutting down instead of just giving choppy playback.

Do you do much heavy CPU with with that machine at all? It’s possible that AV1 decoding is the only thing you’re trying to do that pushes the CPU to that degree. 7th Gen Intel CPUs have hardware decoders for h.265, so the CPU is barely used to play these back, but lacking a decoder for AV1 means it has to be decoded in software, which hits the CPU hard.

Ah, if you need to build a .NET project that makes sense

Nuget is a the .NET package manager. Like npm or pip, but for .NET projects.

If you needed it for a published application that strikes me as fairly strange.

When I initially set up my media server I went with Jellyfin over Plex mostly because the idea of having to create an account on an external service to use software I was hosting myself rubbed me the wrong way. Since then the more learn about Plex the more baffled I am that anyone chooses to use it at all.