What do you thing my Problem is?

teh lags

Honorable
Jan 6, 2013
3
0
10,510
Intel Core I7 3770
MSI Z77A-G43
G.SKILL Ripjaws Series 16GB (4 x 4GB)
Radeon HD 7850
1TB SAMSUNG Spinpoint F3
Asus disk drive
Corsair TX650 v2
Cooler master Hyper 212 Plus
Apevia X-Trooper
Running: Windows 7 64bit
D-Link Xtreme N
Router -APPLE AIRPORT EXTREME 5th Generation Model: MD031AM/A
MODEM -Motorola DCT700 Model

Hey everyone i am looking for some help with a Lag issue i have been experiencing and was wondering if anyone could help me isolate what the actually problem is and fix it. I recently built a new computer and have been playing guild wars 2 but ever 5 to 10 minuets i experience some sort of lag this is not only experienced graphically in Guild wars 2 but interfere's with Skype as well. I am running well over requirements for the game - Radeon Hd 7850. Its odd because when im in game and lag my character contiues moving as usual and the after the lag screen catches up.I know this doesn't explain much but from this what is the best guess to what the problem is and if it is my ISP then what can i do?
Thanks