Why does Creative Cloud sometimes take a long time to update an Application

I have noticed lately that some updates of Applications (mainly Premiere Pro actually) can take much longer to update to the latest version. It often updates to around 85% complete then just sits there.

There is over 1.2TB on my CPU SSD Free. 

I then get a message pop up on screen that says ‘We are aware this is taking longer than normal. We are working on it’ (or similar message)

After that message the rest suddenly downloads and it is OK.

Question is why is this happening at all?. I have 1Gig Fibre and my Home network is fast - so where is the bottleneck?.

Does Adobe monitor Application ‘time to update’ performance?.