Why does my internet cut out every 20 seconds?

[555]

Hello, I've been having this issue for a while. I am a gamer, and I require a CONSTANT RELIABLE CONNECTION.
So here is the issue. I play my games, and then 1 second out of every 20, my internet cuts out. Wifi won't work, or any internet. I've called the company, TWC..., and they haven't resolved the issue.

I entered the command "ping -n 100 google.com", and I pinged google.com 100 times. Except, during those 100 pings only 97 actually were successful. At random times, the CMD interface displayed "request timed out", and then continued its regular pinging. Is there any reason for the cut of of service? Is there anything I can do?

Oh, and I have wicked fast internet. At its max, I can download files at 9mb/s it is insane. But it likes to cut out every now and then. PLEASE AYUDAME.