Nostalrius Begins - Quality wow vanilla realm (1.12)

So I'm lvl 13 and everything has worked fine up until yesterday evening when I started to DC randomly once every other hour or so I'd say.
Today however I DCed like 5 times during an RFC, 3 times prior and now 3 times after. So about 11 times in 3 hours. It's only me in the party DCing and my internet connection is stable and fast, so it's not that.
Once I DC I get stuck in Connecting (and every other try no texts comes up at all except for the Cancel-button) for about 5 mins until I can Connect and resume playing for about 20mins until next DC.

Has anyone any ideas to how to solve this or experienced anything similar?
I might add I've never experienced anything like this on other games or private servers, wither vanilla, tbc or wotlk.

Please advise

Sounds like something to post in the Support Section.

Thanks! I saw it was moved there now.

I might add that I don't use any addons, WDB-folder has been deleted, I've nothing else running in the background that should make an impact of wow...