UnityAds in Services window not really stable enough

It's getting pretty annoying now. Every so often when I go back to my project I get these errors.

The imported type `UnityEngine.Advertisements.Advertisement' is defined multiple times
The imported type `UnityEngine.Advertisements.ShowResult' is defined multiple times

I've switched Unity Ads off in the Services window but every time I have to go back in, toggle them on, then off again.

Currently I'm working offline so now I have to log in (and the popup doesn't remember my...

UnityAds in Services window not really stable enough