Prime Video app no longer works with Cox Contour

This only began a few days ago. Now, a show will start for a few seconds and then I get the spinning circle and then I get this error: "HDMI Connection: There's a problem with the connection to your TV. Try using a different HDMI cable. For more help, go to amazon.com/videohelp." Regular live programming and other apps all work fine, so I highly doubt that there's any issue with the connection between the Contour box and the TV and even if there were, I also doubt the Prime Video app has that level of hardware access to the Contour box to detect it. I have tried both restarting and refreshing the Contour box, but neither made a difference.

I'd suspect internet connection speeds were the culprit except that everything else seems to work fine.