Looks like you are having the same issue I had a while back. It may be your SSD that has gone bad. I’ve tried multiple brands NVME SSD, and the only one that has worked reliably without the issue you are having was Samsung. NUC and Rock are pretty sensitive to the brand of SSD.
What happens if you temporarily connect your ROCK directly to your router via ethernet, bypassing all other network gear? Do you experience the same issue?
This was my first thought. However NUC not powering down. The ROCK software is unresponsive. After a clean install, so far so good. Fingers crossed resolved. Thanks for your support.