This happened last time too.
Hear me out. I'm on Comcast, and a long time ago I had really bad packet loss. Most of my friends didn't experience this though. Some did, but it was like an 80/20 split. Anyway, after a few weeks my issues went away on their own, and suddenly the 80/20 situation reversed. All of a sudden, most of the people I knew were experiencing issues, while I was not.

It's happening like this again, lmao. Could be coincidence, but damn. Go check the tech support section and there's a thread from 6.3's launch talking about packet loss. It's like the same 9 ish people complaining. But then all of a sudden, the thread got real quiet, and now the forums are blowing up with a totally different set of people complaining about the same kind of packet loss. Isn't that weird? I don't know any of the technical stuff behind this, but what a funny coincidence.

edit: Try mudfish btw. It fixed my issues when I was having bad unplayable levels of packet loss.