Can't talk to NPCs

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Time: 5 PM EST
Frequency: Every time
World name: Hyperion
Character name: Tarran Icenguard
NPC name: Almost any NPC
Class/Level: Any class / Any level
Party or solo: solo
In-game time: Not sure, but is still an issue
Area and coordinates: anywhere
Steps:
1. Was trying to get through the "Best Served with Cold Steel" MSQ's instanced battle content and after a few hours I was unable to talk to Raubahn in The Fringes
2. Tried for about 10 minutes more and went to the Gold Saucer and did my Daily Mini-Cactpot for it's 3 times
3. Went to the Quarrymill and tried to do a Palace of the Dead run but was met with the same issue as with Raubahn
4. Went to other NPCs and was unable to talk to them either.

Please fix this as soon as you can, as this seems to be a prevailing issue with other players. People have been trying to do this quest for over 13 hours or more with no breaks or sleeping, this is actually affecting people's health.