@Abbomaniac1988 That line looks to be a line of light that is coming through the video. This will happen if the image is overexposed like it is in the daytime. If you do not have this line show up during night time, then everything on the device seems fine with the picture quality. For the video audio, you will need to make sure your phone is not muted, your sound is up, and the Ring app is allowed to transmit the audio. You can also try disconnecting any bluetooth headphones or watches to see if these are restricting the audio from going through, but if the people on the other side can hear you through the Doorbell, this will be a audio error on the phone's side, not the Doorbell.
I'm having a similar issue with my device, which is the Video Doorbell 2 too, after installing it today. The sound you hear at the doorbell from the phone is clear but the volume on the phone is either really low or you can't hear them at all but you can see their mouth moving. I know that sound is enable as I'm able to hear them if they talk loud but it is still feint. My phone is an iPhone X on iOS 13.5.1 with Ring app version 5.27.1