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

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

You may want to try a clean boot. Simply open the task manager and select the 'Start up' tab. Disable everything here and restart the PC. This will make sure that no background processes are interfering with the game.

Make sure you disable any overlays that may be active while playing (Discord Overlay, Geforece Experience, etc).

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