No video on doorbell

My Ring doorbell has suddenly stopped showing any video. The doorbell rings, I'm notified of motion or someone being at the door, a thumbnail comes up, but the video never loads. If I try to click Live View, I just get the Activating Device... message with the blue spinning circle. It shows that my Wi-Fi is fine, and the battery is charged. My two other cameras are working fine so don't think it's an issue with the app. I've also tried installing Rapid Ring but got the same messages.Any suggestions on how to fix this?