I have had three new,expensive phone in the last year. I'm having the same problem with all three. In the middle of a conversation the line goes dead,(phone is charged) and my other phones are also short curcuited out so that the caller cannot call back and vice versa for about 10 minutes. The phone co. says my line checks out fine. It is always the phone that is plugged into a certain jack. Can I have a bad jack?