Despite bugging my ISP, I still have 5-15% packet loss on my company internet connection, making the MH services feel rather sluggish.
Since they tend to blame me and my equipment when I call them, I'm going to take everything down and test with a separate computer and new cables tomorrow afternoon, in order to produce logs showing that the problem isn't on my end.
I expect the downtime to be somewhere around 16:00-17:00 swedish time.