Apple TV - Netflix Constantly Signing Out

I have the exact same problem. I have used Apple TV for years, it always remembered my Netflix and NOW Tv log ins and passwords and now, everytime I open Netflix etc it wants me to log in, which isn't quick due to using the remote and keyboard on screen.

Is this maybe due to a new OS update?

The latest firmware for the 2nd and 3rd gen were released in 2014 and 2016 respectively, there are no further updates. The 2nd gen is classified as obsolete and the 3rd gen has long been discontinued.

The issue at hand is typically associated with 2 factor authentication, and has been addressed in other threads. Beyond that you will need to consult with the provider.

Netflix's own support article refers to 2 factor authentication. If you do not have it enabled (which not only means your account is less secure, but certain features are unavailable) then you will need to consult with Netflix.

if you have an older Apple TV

Netflix says:

“If signing out of your Apple ID did not resolve the issue, there may be an issue with Two-Factor Authentication...”

so if you sign out of Apple ID you will be asked to use the Two-Factor Authentication to complete the Apple ID login.

I have the same problem from 2 days ago. done every suggestion and still Netflix on my AppleTV 3 asks to login each time I run it.

I'm considering throwing my 2 units Apple TV away and replacing them with android streamers.

See this post

https://discussions.apple.com/thread/250238899

Thanks, mine is 3rd gen. So why is 2 factor auth affecting the apps? I am signed in on my Apple TV and the apps are separate to this? Sorry, don't understand.

Then you will need to consult with Netflix. This is a Netflix issue, and with all due respect the 3rd Gen is 7 years old.