I'm not sure what's causing it, but there has been server crashes extremely often during the PST-EST late night hours, for me mainly 1:00-3:00 EST. Definitely more common around 3:00. It's really unfortunate because in September the server was carrying a pretty high player base into the late night for my timezone, and now with these crashes the server loses around 30-40% of online users.
It'd be nice to know what's causing these consistent crashes, they are very acute and happen without lag. They have been a detriment to the server in recent times