Frequent R0

[JojoX97]

Details: While trying to play my receive latency frequently drops to 0 and stays there for about a minute. I usually don't get disconnected.

Steps:
1: no problems logging in
2: once I start playing for about 1-2 minutes R latency goes to 0
3: R0 continues from 30 seconds to 1 minute
4: I die if I'm in the middle of a fight
5: R latency returns to normal

I've tried the following to resolve:
1: opening firewall ports
2: disabling the firewall entirely
3: port forwarding on my router
4: connecting directly to my modem.

Date & Time: Anytime since May 23rd, 2011
Frequency: Every couple minutes
Platform: PC
PC Manufacturer & Model Number: Custom Built
OS: Windows 7, 64
Graphics Card: Nvidia GTX 480
Type of Internet Connection: Cable

It working fine when I was playing in the states, but I just moved to Korea and starting playing again. This is the only game that gives me any problems.