Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) WHEN did this issue first begin or was noticed?
2) How many TOTAL cordless handsets do you have with this system, and of more than one, does this new VM message appear on ALL handsets?
3) Is your phone service "old style" direct wired service, or is it "U-verse" based?
4) Are you using the provider's voice mail system to take your messages, or the built-in answering system of the Panasonic system?
Please REPLY using the box below.