My experience with Charter Communications suggests a new logo for them; two tin cans and a string!

Some ISPs limit the amount of bandwidth available for up/downloads; some impose limits according to the time of day. I'm pretty sure Charter is among them; it's worth inquiring. (The limits would not affect Warcraft).

I had no trouble with LW 4.18 Pro, but a few months ago I switched to downloading torrents via Vuze.