Have had it Comcasts crappy services

For 4 and a half months, I have been repeatedly getting knocked off my entire network for some unknown reason. I have called comcast a grand total of 15 times to get the problem solved, I have emailed them atleast 25 or 30 times regarding the same problem and this is what they have to tell me.

Comcast Rep: What Im going to have you do is turn off your computer, and unplug your modem, and your router, and wait about 60 seconds, then plug your modem on, then your router, then turn your computer on in that order.

Me: Already did that doesnt help.

Comcast Rep: Ok then try to connect directly to the computer by bypass-

Me: Did that too cant even get connected.

Comcast Rep: Ok let me run a diagnostics on your modem

Me: -_-

Comcast Rep: Your signals are fine sir, there is no outages in your area either.

Me: Then why did I just get kicked off the internet, my modem just completely restarted without no warning.

Comcast Rep: (no response)

Me: Hello?

Comcast Rep: (no response)

Operator: Were sorry, the number you have dialed has been disconnected, please try dialing the number again

YES THE KICK OFF KNOCKS MY PHONES OFF TOO!!!

I make a living on the internet, I stream live video and to do that I need your services to run EFFECIENTLY, not halfassed the disconnects happen at around 9:30 and in some cases 3:00 in the morning, yes im awake at that hour, theres gotta be a like a node in your systems or servers thats causing this problem, because before this we havent any issues with you guys we've been a customer since Adelphia, this is an ongoing problem since July and it hasnt been fixed, Im currently looking into another provider for internet and more or less *gulps* DSL... apparently that service is better than comcast because they can keep a steady connection.

I just want an answer and to see if it can be fixed, if it cant then im done with you guys because your techs that came out did absolutely nothing to resolve this problem, they just replaced a cable connecting to our cable services, that had absolutely nothing to do with our internet problem...

I just got kicked off while typing this very detailed wall of text, all the lights on my modem except for the power went off and completely restarted, again with no warning, i didnt touch anything, Im growing sick of this.

And If i get a response on this chances are your going to run another stupid diagnostics test on my modem, dont. because the diagnostics arent gonna tell you whats going on, yes I know alot about the internet and computers its your servers.