This usually occurs when the server you're accessing is down. Wait and check back at a later date. If still not available within 24 hrs, email your service provider for an update. I keep getting kicked off the Internet. Many issues can affect your dial up connection with the Internet.
Modems operate at frequencies outside the range of human hearing.
Static on a phone line can cause a disconnection. Call waiting is a very common reason for a disconnect. If you have call waiting, make sure you have disabled it before dialing in. If not, you will lose your connection when you receive an incoming call. Checked your phone lines.