Disconnect while doing actions.

I've been suffering from 90000 and 2002 errors, but what actually causes them are actions.

Whenever I type in the chat, the game disconnects.
Whenever I want to buy or sell something, the game disconnects.

Whenever I just play by myself, don't talk or purchase/sell anything, there is no problem..

This is RIDICULOUS, how am I supposed to communicate with a random party saying I need a break for MP, or whenever I want to talk in general..

There was a patch that fixed this problem, the new patch ruined it again.

Square Enix, you make me pay for this game and this is how you respond, with a bad gameplay. If this goes on, I think you might lose a lot of customers.