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

When did this start happening? Has anything changed or updated on your PC that coincides with this?

Are you running the game in Fullscreen, Borderless or Windowed? If fullscreen, try running in Borderless or Windowed. Your computer may be locking up because you have it in Fullscreen mode which might make other things inaccessible if the drivers crash.

Try disabling any overlays you may have active. Also, 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.

Lastly, can you submit a Final Fantasy XIV system report? Simply go to the 'Config' option on the Final Fantasy XIV launcher and to the right of 'System Information' click on 'Display.'

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