I have the same issue. I will also get randomly booted back to the home screen. This is very frustrating!
Said the same thing on this thread and they removed my comment. Out of frustration I just threw out all three of my rokus and replaced them with shield. Problem solved.
I removed Netflix then re-added it. Of course that forced me to re-enter the password which had to be changed since what I knew to be my password seemed to be incorrect. After the debacle of the password was solved, I was able to load Netflix successfully and watch the remainder of what I had been watching.... all without revealing my serial number, which I am always reluctant to do in any circumstance.
Thanks. Will give that a try