Returning player, crashing since last server reset

[Jeeqbit]

It could be a corrupted file. I had this issue with an NVME to the point that I just stopped using the NVME.

SSDs have limited read/write cycles, so eventually a cylinder can't be used and any file located on it becomes corrupted. Your game reads these files a lot so this can happen. If you copy+paste each FFXIV patch file, the ones that are corrupted will give an error. Typically this results in crashes in random areas of the game, depending on what is corrupted. More files are likely to be searched when the game is trying to lookup everyone's mounts, minions and glamours in a busy area.

Identifying the corrupt file isn't useful, because the game has no way of scanning for this corrupt file. SE flat out gives you the option to redownload the entire game and that's it, unfortunately. If you manually restore some files yourself then reboot the launcher it could miss some due to the way it works, so it's safer to just redownload the entire game if a file is corrupt.

Your settings files can also become corrupted in Documents\My Games and for those you can use a process of elimination backing them up and deleting, then slowly restoring the original files one at a time and seeing if it crashes or not. But usually if settings files are corrupted you flat out crash when you login or slightly interact with hotbars, settings, keybinds, macros or HUD elements. This is why it's good to backup settings or back them up to the cloud regularly, especially after major changes to HUD/hotbar/settings.