Samsung gear S3 Frontier shuts down after overheating message.

Last week my watch showed the message Watch overheating. Shutting down. I left it in an air conditioned room for a few hours and tried restarting it. It booted up and gave the same message before shutting down again. The watch is fully charged. The same issue persisted for the next 4 days. I tried factory reset but the same message comes up before shutting down. Suggestion?