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Credorion, were any updates or changes made to the PC? Does game crash happen on multiple characters? Please try doing a cleanboot. Open the task manager and select the 'Start up' Tab. Disable everything here and restart the PC.

Amg, could you provide the following in your own thread?

-What you have tried to alleviate the issue
- System report ( go to the 'Config' option on the Final Fantasy XIV launcher and to the right of 'System Information' click on 'Display.')

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