Player becomes desynchronised with server

Date & Time: 8/9/2013 5:05pm (AEST)
Frequency: Sometimes (almost hourly)
Character Name: Kanetillus Highwind
Race: Lalafell M
World: Tonberry
Class/Level: Level 30 Arcanist
Area and Coordinates: Class Duty
Party or Solo: Solo
NPC Name: None
Monster Name: None
In-Game Time: Unknown

Steps:

1. I was completing the level 30 Arcanist class quest.

2. The character de-synchronizes from the server so that I can no longer attack or interact with anyone or anything.

3. I can move freely around the area as though there is no issue and target anything as usual.

4. Party members report that my character is simply standing still to them.

5. The location or activity doesn't seem to matter. This issue has occurred before, during and after battles, as well as before during and after interacting with NPCs.

Specs
Windows 7 64 bit Service Pack 1
Intel core i7 @ 3.4GHz
Ram: 8GB
DirectX 11
NVidia Geforce GTX 670