Not really sure what to make of this issue now, but at least the game is returning a recurring error code. Basically, during any loading screen after selecting a character, my loading progress bar will freeze, and after roughly a minute the game will disconnect me with that error, 00102.
Also, recently before this problem reached the head it's at now with me, I had noticed that while dungeoning with friends, my game client would freeze the actions of other players and enemies for a random length of time. Felt like a momentary lapse of connection to the server, but it never dc-ed me, and if I waited it out, the game would eventually catch me up to the rest of the players (often with me being dead to something I was unable to see/react to).