Horrible Lag

For the past six months I have been getting worse and worse lag from the hours of 5 pm to 11 pm EST. It has gotten so bad that during those hours (the main hours I am home) playing a game or using the internet for anything but simple web surfing has become impossible. 

During this period of the day, my ping will consistently jump between 50 and 500+ making doing anything, especially playing a video game impossible. This happens no matter what game is played, below is a specific example from tonight showing a screen shot from Valve's DOTA 2, I also have a video of this happening for two minutes before I get so fed up I quit playing. This does not happen to other friends who live in the same city and use cox cable.

At the suggestion of a cox cable phone support associate I bought a new cable modem to take advantage of the premium internet I am paying for. This has not helped the issue at all and in fact has gotten worse. For reference I am directly connected to my router (brand new Linksys WRT 1900 ACS) via a cat 5e Ethernet cable. If I am on super late or during the morning (rarely) I do not see this problem.

Sadly during the last six months it has been more like dial up than high speed internet, which is upseting since I pay for the premium level of internet which should get me 100mbs down, if this issue does not get resolved I will be forced to seek another internet provider.

-John

P.S. - Cox's forums do not support either Windows 10 or Chrome and so it will not let me insert the image. If support personel wish to see it I have both images and video to show the completely awful connection.