

I don’t know AMD CPUs that well but could it be you are CPU bound?
I have the same gpu RTX 3070 with an i5 8600k and Im CPU bound, not by much though. Last time I played Witcher 3 it was running very good only in Novigrad it was stuttery due to the amount of characters


I believe he should check his NM Status like this:
systemctl status NetworkManagerOr also check the logs dmesg o journalctl