My YouTube app sings me out continuously, I only use it to watch videos from my profile I...

If i remember correctly i think you might try going to youtube.com/activate to link your google account. If there is someone else using your account to watch youtube, that could be the reason why its signing you out continuously.

Youtube app is rubbish compared to the 360 one, why the step backwards? Also when I am using the youtube app and watching a video if my son walks into the room it'll sign him into the xbox one but also cut out my video I was watching and sign me out of youtube
and sign him into youtube?

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That can't be right can it? Just because someone signs into the xbox one it should not just switch user on the app I am using unless I sign out, games I play don't do it?

The Irony of the new dashboard and app use has not been missed by me.

My dahsboard is full of adverts yet I can watch youtube with no pop ups pre, post or mid roll adverts and thats why I've been using that app.

Now if only i could use my 360 to upload my new videos.................

It tells me I have to log into youtube to be allow to watch it.

Why would I sing up on youtube?

Nope.

you're better off not watching 4k vids on youtube. is it only youtube that does this?

Yes only youtube. Downgrading the videos does not work. I can't control how the videos are uploaded to YouTube. I can switch to my roku but I would rather stay on my Xbox since I use it for most things