Router causing disconnects every two hours only in world of warcraft (MMO)

If I run my ethernet from my modem to my computer I do not disconect. If I run the ethernet from the router I disconect around every two hours. Restarting the game before I disconect resets the timer for another two hours.

A winmtr run from game start till disconect has a latency build up starting at the first hop in the worst column.

My lease time is 24 hours, I have the ports for the game open on my computers internal IP. The game devolopers wont help me because its a hardware issue.

I don't really know what else to try, my firmware is current and I have had the problem for over a year.