Frequent Freezes
The game freezes very frequently during certain times of the day, presumably when it's more busy. 1:43 PM Easter Standard time on Friday is the current time here, and I've already had to reload the game 5 times in the past 60 minutes. The Glorious Valley Server, through the web (not the plarium play app).
Also, if the game doesn't completely freeze, oftentimes certain buttons or commands will stop working unless one logs off and back in. A common one is the Events tab on the left side of the screen.