I noticed my VS2 free server wasn't replying to pings and my ssh connections had disconnected. Day or so later I logged into the serverdata section to see what was up--all green. Huh, that's weird. The control panel or host didn't realize the guest VPS was offline/down. Traffic graphs in the control panel are also flat for the last day or so.
Went ahead and hit the reboot page and now the server is back online and normal again. Looking through the logs on the guest VPS, last entry is about May 13 16:04 UTC, which matches the smokeping data (image attached). Nothing in the logs to indicate a crash or violent shutdown--it's like the guest just suspended. (Sorry, I didn't think to run an mtr trace before I rebooted.)
Anyway, I'm thankful for the free VPS, no complaints there!
server name: srv6222.blue.kundencontroller.de
IP: 2a02:0180:0006:0001:0000:0000:0000:07af