Last night when I streamed, I was only able to play for about two hours before the ping shot up to 1k+ and stayed there. Couldn't figure out the issue despite numerous resets and disabling my addons. Resetting my router after stream didn't solve it either. Everything that I could see on my end (download/upload etc) was totally fine and my ISP wasn't reporting any issues.
This was on PCNA around 10PM eastern, in multiple zones and cyrodiil.