I keep getting this Unexpected error (17) everyday and cannot log in

[KingEndimon]

The error is when I get into a random map, suddenly game stop loading and an error appear saying: "An unexpected error has occurred. Exiting FINAL FANTASY XIV. (17)" then crash me out of the game. After that I cannot log in my specific character (my main) anymore. I can still login the game and get into other any characters except my main.

This is the 3rd times I got this error and the 3rd day also. It's like everyday I got this error. It's very frustrating. I tried the Techsupport and the only advise they give me is to reinstall the game, which I did. And I can login the character, but then it will happen again later at some points, then I get tech support and they told me to reinstall. And the cycle reappear. I even try to change my installing directory and even My Documents folder to see if the files corrupted was there but even after that error still occur.

Seriously I don't know if reinstall really fix this problem because then it will just happen again. Maybe give me some other advice for how to prevent this error to happen? Because redownloading the game everyday (30GB) took me 6-7 hours and it's not a fun thing to do.