What happens to me is more random. few and far between, then all the time.
So, while I am on the internet and have a solid connection all of a sudden it will switch to public.
I just rebooted the modem/router, and I get connected again with private.
At first, I could not find the toggle to...
What I believe causes this is the internet provider monitors the usage on how much data a person uses on the internet with a particular computer. If above a certain amount they kick you off of the private network or they throttle the connection down.
Really to tell what is really happening one...