Good afternoon and thank you for posting in the Final Fantasy XIV Technical Support Forums.

If it is only happening with this one character, you may want to try deleting the locally-saved data folder (My Documents > My Games > Final Fantasy XIV).

Could you also provide a system report? Simply 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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Hope to see you online!