Are you shutting down your PC after the crash or just reloading the client? I'd suggest shutting the PC down completely, then boot back up and restart the client.

This isn't a solution just a suggestion that may ease the crashes. While I haven't had this crash in FFXIV I was having them for a while in Destiny 2. What I found there was that if I just restarted the game client then I would crash again within 30 mins or so of relaunching. However if I shut down my PC and restarted I would often (though not always) go the rest of my gaming session without seeing a crash.