getting lot's of error every 30-60 minutes.

[Seirra_Lanzce]

Platform: Windows 7 Ultimate x64 PC
ISP: Telekom Malaysia Berhad (Unifi)
Type of Internet Connection: Fiber Optic
Internet Connection Speed: 20mbps
Date & Time: 07/25/2011, 00:59
Frequency: every 10 minutes to 60 minute sometime after 3-4 hours.
Character Name: Seirra Lanzce
Race: Miqo'te Seeker of the Sun
World: Besaid
Class/Skill Rank: 44
Physical Level: 47
Area and Coordinates: random's part of the world. also in Toto Rak as well.
Party or Solo: Solo/Party
NPC Name: -
Monster Name: -
In-Game Time: can't remember
Steps:
1. I've close off any other downloads possible, even my Steam downloader and Origin Downloader.
2. I've set up QoS on my router for performance gaming.
3. Log in.
4. Random time and i get disconnected.