Troubleshooting - Noise is heard, sound cuts in and out. - Cordless Telephone
Possible cause and solutions
If you are hearing static on your phone, reception breaks in and out or experiencing humming noise on the background while using your cordless phone, it might be caused by a transmission or electric interference, noise can also come from the phone lines, it would be best to locate the source of the interference first and a simple method of determining this would be to verify if static is heard on your other set of phones aside from the Panasonic.
Relocate or plug the Panasonic phone to a different area where there is less interference.
If you are subscribing to DSL/ADSL service, it is recommended to use a DSL filter. Most DSL/ADSL service providers would have the filters available for their subscribers, you may also check out your local electronic stores for availability.