I went through the same thing!!!
We used to have a cable modem from the local cable company, but it would stop working for 4-12 hours each day.
I would call them and ask WTF???
And they would be like "Are you SURE its PLUGGED IN HON????"
"Well, MY computers say its working!"
We had 3 tech guys come in and had the modem replaced 3 times, but the friggin thing just wouldnt work!!!!I got tired of dealing with them and got a DSL modem from the telephone company instead.... When I called to disconnect my service from the cable company they transfered me to 5!!! different people, and to each person I had to answer the question "why are you discontinuing your service?"
me: well, because you $40 a month serive sucks.
"well let me transfer you to tech support and they will fix it"
me: NO GODDAMMIT JUST COME PICK UP YOUR FRIGGIN MODEM!!!!
5 friggin times......
Anyways, I FEEL YOU PAIN!