I've been having similar issues as well, even back around May/June when I first started playing. The connection icon in the upper-right corner of the screen will turn red, and receiving turns to zero, like there's some sort of timeout issue. It's EXTREMELY frustrating to have the game randomly kick me off for no apparent reason while I'm doing a leve for guild marks, or crafting with rare materials, and then suddenly everything's gone, you failed, too bad, nothing you can do about it. I've tried port-forwarding on my router (I've had similar issues with other games and usually this was the problem), but I still got this error shortly afterwards. It HAS to be on Square-Enix's end, because my internet connection is fine otherwise.

I can deal with the game content as a whole being rushed and in need of fixing, but when I can't even play the game at all without this BS happening, something is very wrong. I'd expect this kind of crap from Sega's horrible staff, but not from Square-Enix. FIX IT.