Perhaps related to the previously noted problems and perhaps not, but a few nights ago my son came in while I was watching Netflix streaming and said he couldn't watch anything because too many devices were in use. That didn't make sense to me, so went to checking and long story short someone had jacked my account somehow and was apparently using it to babysit kids with a bunch of Disney stuff no one in our household would ever watch.
Check your Recently Watched queue once in awhile for irregularities.
Of course Netflix in their great wisdom no longer allows access to individual devices, so I had to change my password and then disconnect all devices. That put a stop to the interloper.
You don't want to know what heinous punishments I think should be meted out to those who wreak havoc on the lives of others via the internet with viruses, hacking, and such.