Review the instructions you used when first installing the PrairieWeb software and be sure all the settings are correct. Call-waiting may interrupt a call. Any other devices connected to the line can disrupt your connection. Even nearby electrical devices may cause problems. Check for loose connections of any kind to or from the computer, modem or wall jack.
Line noise is a frequent culprit for dropped connections.
Try to make the lines in your own building as pristine as possible, unconnected to and away from other electrical devices. Be sure that you have the latest driver or firmware for your modem installed. Most modem manufacturers maintain websites where the latest drivers can be downloaded. Even if you recently purchased your modem, it may not have the latest driver. While Downloading Files PrairieWeb's Servers will automatically Disconnect you after 14 minutes of inactivity.