About a month ago, my parents started experiencing terrible call quality using Rogers Home Phone. Callers can hardly understand what they are saying due to frequent break ups. The break ups usually disappear within 60-90 seconds. They're using VTech DECT 6.0 cordless handsets with the base station plugged into the home phone modem.. This modem and their Internet modem are connected to a coax cable splitter which was replaced yesterday (didn't make a difference). They also have an old corded NorTel phone in their bedroom which does not experience this issue. Any ideas before they replace the VTechs? If it's a phone issue, seems weird the breakups disappear after 60-90 seconds.