Nanopool telling me the worker has gone offline
For testing, I only ran this miner on my PC only. In the last 24 hours, I have received 10 emails from Nanopool that the miner has gone offline.
It looks like this:
```
Your worker "worker" has gone offline.
To check worker`s status follow this link:
http://xmr.nanopool.org/account/address/worker


Best regards
http://xmr.nanopool.org

This is an automated e-mail. Do not reply.
2021-05-21 06:25:50 GMT-4
```

Is this normal or some local issue? 
Thank you