Hi there, neighbors! When you have multiple Ring devices, and only a small number of them are having issues, the best next thing to check is environmental and placement differences. If this Ring device placed further from the router, is separated by multiple interior/ exterior walls, or has large appliances or many appliances between them and the router. Check out our Community post optimizing wifi signal strength for more tips.
Another great step is to power cycle the Camera in question, either by unplugging or removing battery, waiting a moment, and powering back on. I hope this helps! 