Make sure that your Caps Lock key is off and that you are spelling correctly. There are many reasons why a connection will not run at the modem's maximum speed. This Interference is generally referred to as line noise'. Check with your modem manufacturer for any updates that have been made for your modems. Drivers are the most common, and require you to load the new drivers over the one you are currently using.
Firmware refers to the modem's code.
This requires a special program and files supplied by your modem manufacturer, which are available on the manufactures website at no charge. Like many computer peripherals the criteria for modems changes rapidly. Many of the modem companies are constantly updating the software for their product. It is a good idea to check with the manufacturer's web page once in awhile for any updates. There are many reasons why you might get disconnected from the internet.