This is an odd event to hear about @Herbhead. Good call checking for electronic interference nearby! As this is happening on both devices, I recommend checking network signal strength next. Check out our Community post about RSSI for tips on optimizing wifi signal strength to your Ring devices.
Please also ensure there are not shared users or additional mobile devices that you may have granted access to, that might be answering an event or triggering a live view. If this is happening on answered videos, keep in mind that too close of proximity between phone and Camera can certainly cause an echo or feedback. Try power cycling the cams by removing and reapplying power. I hope this helps! 