Hello & Welcome to Just Answer,
Sorry to hear of any issue with your phone(s).
May I ask:
1) The TOTAL number of cordless handset you have with this system (working or not)?
2) WHEN this issue first began (or was noticed)?
3) Has there been any "weather" or "power issues" in your area - since this was noticed?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved.
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)