Few Ring Sensors Going Offline

Good Morning:I have an issue where three sensors will work for a few days, then disconnect from the ring system, then eventually go offline. I've replaced batteries, removed and readded (including the z-wave removal option and they continue to do this. At this point while three of my other sensors have given me no issue, it appears these other three are faulty. Do I have any option to get them replaced if I bought my security system a little over a year ago?