Your network doesn’t work properly (or your DNS server).
Seems your system disk is dying.
If you mean the literally, that your PC is rebooted - then it only confirm my suspect that the system disk is to blame. It can reboot only when the OS is crashed (Blue screen). So you must see the event related to the crash.
The node itself is not able to reboot a PC, it can only crash itself and the service will be stopped. You may found a FATAL Unrecoverable errors in the node’s logs in that case.
You need to forget them: