I wanted to comment again to explain how my Mac was fixed. I'm on an ethernet connection so it is hardwired. They kept wanting to send me updates in exe files so first I had to explain I couldn't open them and didn't need them. I had to reset the whole computer, then update the firmware, then update Smart Hub. It took three chats to get through all of this because each time Netflix worked without signing in again, but the next day didn't. I've checked 3 times since doing all these updates and it works fine. No more sign ins. My advice is to do a chat and get the addresses for these if you can't find them on Samsung's support pages. Search reset, firmware, smart hub update. The support chat is very good but you have to be persistent. They will stop at the first level. Then you have to go to the next and the next.
