Q:
Lagging/disconnecting
There’s a lot of internet between your computer and ANet’s servers; you’ll need to do some follow-up. Fellow poster, SlippyCheeze says it better than I do:
It’s possible that the problem is anet, since you have eliminated various options, but the bad news is: nothing fundamental changed in their architecture in the last patch or anything like that. Traffic profile is still pretty much the same, suggesting that there is maybe some intermediate point between you (and your two ISPs) and anet that causes the trouble.
https://www.pingplotter.com/fix-your-network has a good guide for identifying where the problem is, but if you have trouble with that feel free to post screenshots from it and we can help work out where it is.
Unfortunately, the Internet is built in a way that three to five companies handle your traffic, if not more, just inside the continental USA. There are lots of places that the problem could spring from that neither end is responsible directly for.
I recommend that you also start a support ticket and start talking to ANet about it. If the issue is on their end, they’ll need your info to track it down. If it’s elsewhere, they’ll help you figure that out, too.