I know alot of you have been getting the "Disconnected from servers" issue as soon as you try to log in if you took a break from this game (not sure how long of a break is required for this problem to arise). The way to fix this is to just change your password and it works.
Change your password here: https://en.nostalrius.org/password . I Hope this helps because I saw so many with this problem and no solution. This has worked for myself as well as my friend.