Solved

Glitching Netherlands

We're still having memory issues on the servers, I'm unable to work on it at the moment but will be able to from tomorrow. At the moment I'm just taking races out of the server when they have the issue. When this happens, it spreads the "experience" across the whole server, because it's a memory leak.

I strongly suspect all reports like this at the moment are caused by this.

I've created a new thread to centralise all discussion about this and to focus on the solution:
https://igpmanager.com/forum-thread/64092

Closing this one.