Please take precautions to save your work before the limit is reached. You have been inactive for 30 minutes. There is a 30 minute inactivity timer on the modem pool. This serves to keep people from accidentally remaining connected for long periods of time and using up their quota. Abnormally noisy phone lines can cause you to become disconnected and prevent you from connecting.
Many times noise occurs after it rains, but disappears when the ground dries.
If you have a lot of noise on your line and you suspect it is causing connection problems, contact your phone company to have the line tested. Southwestern Bell can do this over the phone while you wait in about 5 minutes.