Constant (30002) Errors

[Jiggly]

Details:
Since patch 1.18 I have been getting the (30002) error every 5-20 minutes, and also the game connection constantly changes between green, yellow and red. At first, I thought it was my connection, however after stopping everything else it still happened, and even stranger, if I log onto another character, either on my account or another account, I do not have problems on those characters. I have also tried reinstalling the game completely.

Sometimes this fixes itself for a while, but then it does it again and then carries on doing it for a long time.

In short, I keep getting kicked off but only on my main character (Jiggly Puff) but any other character is fine.

Edit: I have now also found out that if I log onto my character from a different computer, there is then no problems, however I have tried deleting my character files in case any of them were corrupted, and this has not fixed it.

The full error code is (30002)1311538660,21271661,5

Steps:
1) log in.

2) connection is fine, until game crashes (says FFXIV has stop responding and it closes)

3) load game back up

4) have bad lag, especially when doing things such as crafting, and connection keeps going into yellow and red.

5) Get (30002) error and kicked up to the character selection screen

6) log back up

7) error occurs again after 5-20 minutes.

Date & Time:
First started happening Friday 22nd of July, and has still been happening since.

Frequency:
Always

Platform:
Windows PC

PC Manufacturer & Model Number:
Homebuilt computer

Operating System:
Windows 7

Graphics Card:
Asus ENGTS250

ISP:
Virgin Media

Type of Internet Connection:
Optic Fiber