Woah, I guess I have to report another bug then, which is that it never told me about this update, even though I have it set to "Always check for updates to this version".
I'm connected like this, if that's what you mean:
My PC --- Switch --- Modem router --- Internet
It's a wired connection all the way.
I have now updated to 2.5.4, I'll let you know if I keep having the issue.