I am having the same issue the past 2 days. I ended up turning on my WTFAST and chain linked atlanta >> to canada east's "best". Funny my issue stopped occurring. It could be a few things(not in order):

1: I pinged some chicago servers on ping test and it kept returning packet loss. (Maybe something bad in chicago)
2. The Montreal server is being stupid again.
3. SE f'd up something in their servers. (could be why they cancelled their maint)