Doorbell 3

Hi - for no apparent reason my doorbell stopped working on my app. When I clicked on live view it simply spun and wouldn’t connect. It continued to show motion being detected but when viewed, it was recording a black screen. I could access the camera in my garden no problem. Battery health is perfect and signal strength perfect. The only way I’ve managed to get it to work is to delete the iOS app and reinstall. Now it works. Why is this as it’s meant I’ve had no security for 2 days? Thank you