I am usually playing at this time and personnaly haven't had much trouble but have observed others having problems. One empirical observation it seems to me it hits people in groups a lot more than solo players. The one night it was a serious problem for me I was in a group trying to do a tour (which we had to cancel). It was mentioned by poster that he observed the logout trend, I have seen this too with a stream of maybe 15 logouts with no logins, followed by many of these same players logging back in.