As of 10 minutes ago, I have started getting persistent hiccups in game play, including total freezing for several seconds; I happen to have a connection quality monitor running, and there are no issues at my end.
I was playing around Bar Hurin, in North Ithelian with no issues last night; tonight it is unplayable, DX11, or DX9, gfx from ultra to high, fringe detail and half a dozen other settings that SHOULD improve fps are having no effect; cpu still has headroom yet - 2-12 fps, compared to 25-30 fps last night.
UPDATE. I am a bit of a Trump; I had left my PC in super ECO mode.
1% packet loss though, and a lot of hitching......