|If you connect directly from the modem to your PC, definitely call your provider. Either they are the problem, or the modem is.|
If however, you have a SOHO Router between you and the internet connection, or you have a combination modem/router/wireless access point unit given to you by your ISP, then click on my name above in this response and read my “how-to” guide titled, “Troubleshooting Wireless Issues” and go through the steps listed there.
While the guide was written to help troubleshoot wireless issues specifically, the same troubleshooting steps are valid for a SOHO Router.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.