Thank you for the information HamukoArisato.

When exactly did this start happening? Do you recall anything updating/changing on your PC that coincides with this?

Have you attempted to reinstall the game? If you have not, make sure you delete the locally saved folder as well (located My Documents > My Games > Final Fantasy XIV).

Is any part of your computer overclocked?

You may want to try setting the compatibility mode to Windows 7. Right-click on the ffxivboot.exe file and select ‘Properties.’ Then select the ‘Compatibility’ tab and choose Windows 7.

Additionally, make sure that there are no overlays present while playing the game (Discord overlay, Geforce Experience, etc.)

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!