Wireless Interference problems

Working with 2.4 G cordless telephone, and the Linksys router wireless. Were both on frequency channel 6, changed router to channel 1. Still have issues with DSL cutting off 1-3 times per day, and the cordless phones do not work consistently. The network connectivity is working for the most part unless the DSL goes off, in which case I have to reboot the DSL modem and the Linksys router. Please advise what configuration I am missing, or is this something I have to just deal with? Live in Everglades City, which is rural area.