First off, my Apple TV appeared not to work - I swapped cables, nothing! So I got a new one, same model. Worked! Yay!
Simple enough, though sadly since then the new one did the same a few days later and I now conclude it may be the port on the TV that is being flaky, so on a new port - bugger. I may have chucked out a working Apple TV. Idiot!
However, that aside, the new apple TV is being odd.
Yes, I signed in to iTunes. I have 2FA set up, but that is not actually the root of this issue as I tested today. That all worked, all my stuff shows.
Problem is that every new episode of something I want to watch, even though already purchased, is asking for my Apple ID password, every fucking time.
To start with it popped up on my iPhone as well, so I had a keypad to enter it, but even that has now stopped.
It is making watching anything on Apple TV unbearable and I have no idea why. I have already removed the old Apple TV off my account. I tried removing 2FA (and have since put back). The best I have now is dictating my password for EVERY FUCKING EPISODE!!!
I have no idea why - I even told the Apple TV not to ask for password for purchases, yet it does, many times, and the still asks every time you try to watch every episode.
I will have to ditch it if this keeps up.
P.S. tried all the suggestions, thank you all for them. Finally removed from iTunes, factory reset, upgraded, and re-set-up. Seems to be being sane now again. But really, what a messed up failure mode.
P.P.S. Bollocks, that was fine for two episodes and then again is asking.