Error core 90k, followed by error code 5003 (October 15, 2013, 5:20pm Eastern)

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Same here, as well as a tank who seemed to have it a lot:

Time: 22:30pm Eastern
Frequency: one time
World name: Ragnarok
Character name: Ephef Ell
NPC name: Not applicable
Monster name: AK run
Class/Level: WHM/50
Party or solo: Party
In-game time: I have no idea.
Area and coordinates: AK, second area
Steps:
1.Fight, blackout
2.Error code 90,000
3.Error code authentication issue, code 5003
4.Had to re-launch the game, but I got straight back in.