Poor audio/no Audio issues

I have the Ring Pro 2. When I first installed it everything was working fine but now 3 to 6 months later we have no outside audio. I use to be able to hear the birds, the wind and vehicles on the street and now nothing. If some one hears the doorbell I can hear myself talking through the live view but can’t hear anything the person is saying. Video still works great but just seems the microphone isn’t working anymore. I took it down to check the connection and all seems fine. I would assume the doorbell and video wouldn’t work if the wiring was loose. Please help! Thanks