I noticed some of my nodes turned themselves off for no particular reason. Server is fine. There are even other nodes on it. They are fine. They did not turn themselves off. On those, who did, I see this:
Were they really off? And did you really not get a notice, in an earlier stage? Or did just the online score decline? Do all the nodes have about the same online score?
Because I got a comparable issue lately, which was attributable to DDOS-prevention. In my case but the ASUS-router I use.
So basically do nothing and keep the nodes running? I simply restarted them and they are working.
It is just that I did not notice some of nodes were offline for several days…
No. They were off. I assume after an update they did not launch properly and I did not see it for several days. Restarting them started them just fine and as you can see, there is traffic.
No, just keep them online. To fully recover the online score they should be online for the next 30 days. Each downtime requires additional 30 days online to recover.