This has been affecting me since 6.35 as well (UK-based). Last hop before the data centre on a traceroute always times out. It's usually playable, but it's clear there's some lag (I currently get better pings to the US datacentres than I do to the EU ones). But sometimes everything in game freezes for 1-20 seconds, even if the rest of the internet connection remains online and perfectly stable - there's then a 50/50 chance that either the game catches back up, or boots me from the server. I've already had two solo Eureka Orthos runs ended by such disconnects, which is always fun.

Complete lack of acknowledgement is a bit worrying now - not even a note to say it's being investigated or worked on. Genuinely worried this will ruin raiding if it persists until the new tier in 6.4.