Check your event logs and see if you are having this error - i grabbed this off another post

Event Viewer Log A
Faulting application name: ffxiv_dx11.exe, version: 1.0.0.0, time stamp: 0x55b2d5a0
Faulting module name: ffxiv_dx11.exe, version: 1.0.0.0, time stamp: 0x55b2d5a0
Exception code: 0xc0000409
Fault offset: 0x0000000000da90f3
Faulting process id: 0x2540
Faulting application start time: 0x01d0cba7e9bda4c0
Faulting application path: D:\Onshava Games\FFXIV\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\game\ffxiv_dx11.exe
Faulting module path: D:\Onshava Games\FFXIV\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\game\ffxiv_dx11.exe
Report Id: a024e1fa-0fc6-40b0-8293-8be4a3ee2a6c
Faulting package full name:
Faulting package-relative application ID:

Event Viewer Log B
Fault bucket 115992133351, type 5
Event Name: BEX64
Response: Not available
Cab Id: 0

Problem signature:
P1: ffxiv_dx11.exe
P2: 1.0.0.0
P3: 55b2d5a0
P4: ffxiv_dx11.exe
P5: 1.0.0.0
P6: 55b2d5a0
P7: 0000000000da90f3
P8: c0000409
P9: 0000000000000000
P10: