A miracle has happened and the RasPi got online again, so the server is running now.
I'd prefer not to move it, because of the automated backups I have set up. When we move the server, there won't be any backups. I'll try to keep the server online for as long as I can (remember, it's running in my "old" home from which my wife has kicked me out, and I don't have a suitable "new" home yet).
I found a race condition in the cClientHandle code that could have caused the crashes when a player disconnected from the server. Fixed in the repo, will recompile new version.
The server crashed again.
I was online on the server when I suddenly got disconnected from the server. I couldn't get back on because the server thought I was still there, so I tried to kick myself using the webadmin. That didn't work, so I thought that the Core wouldn't let me because I'm an Owner. When I tried de-ranking me the server crashed.
EDIT:
It seems the server restarted itself

Yea, I set it up with an auto-restart (and auto-update at that moment) script

Unfortunately I will have to turn off the Gallery server tomorrow, I'm moving out. I have two friends who said they could host the Pi at their home, so hopefully I'll be able to set it back up rather quickly, but still, I expect a few days downtime.
Might be usefull to update the main post when it's offline.
If everything goes smoothly, Gallery will be running monday evening. Let's hope my friend can set up port forwarding

The server is back online

Great

I think someone keeps crashing the server, because almost everytime I go to the webchat the chat is empty even though I logged in, or talked in the webchat.