Is your administrative service restarting. I haven’t seen this issue before only when that service isn’t started.
do you have a web front end server or is it just the main polling engine
That type of behavior with those links missing No manage nodes or discovery would be a license issue.
I had this same issue this week. Follow the instructions in this article.
- solarwinds site
- strip out the host name and leave blank
- set the ip address to all unassigned
worked for me