Videos watched back always faulty (iphone, android, ipad, windows pc)

Videos stored on our ring plan, and watched back on ANY device, and both in apps and in browser, without fail will start of just fine, but then the image freezes after an indeterminate period of time (sometimes almost immediately sometimes after a minute or so), while sound continues. Sometimes watching them back on another device gets a bit further, or hard-closing the app and restarting gets a bit more, but eventually it'll always fail playback. With this variation for the same video on different devices or sessions, it seems the camera/doorbell itself isn't the issue. Ring has a problem with its storage, or our account has an issue. Anyone else have the same, before I have a bit of a whine to tech support? (Video Doorbell Pro 2, using the mains adapter).